Do try to recognize, that asking and answering 'Why did Trump fire James Comey?!', is, in absence of an exhaustive cross examination of Donald Trump, nothing more than an exercise in expressing your own feelings about Trump, and Comey. Period.
The only facts that we can actually know at this time, is that shortly after the Deputy Attorney General, Rod Rosenstein, was finally confirmed by the senate, with high bi-partisan support (and which satisfied some procedural protocols for removing the agency director, from a staffing perspective), and he was asked to write a report on Comey's status as director of the FBI, and his conclusion (which as he adamantly expressed, even reportedly threatening to resign if it was misrepresented[OOPS: reportedly, that 'reportedly' is fake news. STUNNER], was not the causal reason for Comey's firing, but simply an evaluation of the existing situation) was that Comey was compromised and ineffective, and that the FBI would be better off with a new director.
Of course, as I posted last year, Comey, by his own testimony, had used his position as head of investigations, to make prosecutorial, and even judicial judgments, about whether charges should be brought or pursued, against Hillary, Huma Abedein, Anthony Wiener, etc. For me, that alone warranted his instant termination. My own question on why Trump fired him, is not 'Why now?' but 'Why not earlier?'. However, as James Comey himself noted in his farewell letter, the president has the power and authority to fire the director of the FBI at any time, for any reason. You should note, that his removal does not halt or impede any ongoing investigations. It's also worth noting, that his temporary replacement as Director of the FBI, Andrew McCabe, is a Clinton appointee, who has shown, especially through his wife's campaigning for office a potential for highly partisan leftist leanings - Trump is unlikely to get much aid and comfort through his position as director, so do tailor your pet conspiracy theory appropriately.
Why did Trump fire him? Because he felt it was time to. And in typical Trump fashion, having reached that decision, he acted swiftly, and in a dramatic fashion worthy of Reality T.V. - Comey found out that he'd been fired while standing in front of a room full of FBI agents, as they saw that the TV monitor behind him, was running the news crawl that Trump had fired him. Talk about your ratings moment!
For those of you who are all up in arms about this, honestly, I can only laugh and shake my head. America as a whole, Left, Right, Center and Libertarian, has shown itself to be uninterested in, and unfamiliar with, the concepts of, and structures of, our constitutional republic, preferring popularity, personal interest, and 'gotcha!' partisan political posturing, to prudent wisdom in governing. America, sorry, but as you clearly prefer to be entertained by the likes of South Park, The Simpsons, and Reality T.V., and YOU voted on that basis, whether for Clinton, Trump or the also-ran obstructionists, for President of the United States of America.
THIS is what that looks like! What did you expect?! Personally, I expected much worse, and so far I've been pleasantly surprised with what Trump has, and has not, done in office - I was imagining much worse. I dislike his lack of understanding our constitutional principles, and especially his economic views, but despite your angst and caricatures, he has a long history of capable executive, management and administrative abilities, a fond regard for Americana, as well as a flare for drama and publicity, which he's honed through a decade or more of Reality T.V., and so far, he has used all of that to deliver above my expectations. Fingers crossed. Salt tossed over shoulder. Wood knocked.
For those whose reactions are dramatically different from mine, they might have been summed up best by Stephen Colbert's startlement at his audience's failure to be up to speed with the PC Media's latest 'against him, for him, against him' positions on Comey, as they cheered when he announced his firing. The thing that came to mind for me, when I heard that, was George Orwell's '1984', as the crowd is being led in 5 minutes of hate against "Eurasia", and the speaker receives a message and stops mid word, and changes to "Eastasia", as the hate continues on unimpeded. Unfortunately, Wiki is the best source ref that I can do at the moment, but I think it captures the Colbert moment in '1984':
"At the start, Oceania and Eastasia are allies fighting Eurasia in northern Africa and the Malabar Coast.
That alliance ends and Oceania, allied with Eurasia, fights Eastasia, a change which occurred during Hate Week, dedicated to creating patriotic fervour for the Party's perpetual war. The public are blind to the change; in mid-sentence an orator changes the name of the enemy from "Eurasia" to "Eastasia" without pause. When the public are enraged at noticing that the wrong flags and posters are displayed, they tear them down—thus the origin of the idiom "We've always been at war with Eastasia"; later the Party claims to have captured Africa."
"These violent delights, have violent ends"When you comment, and act, not from careful consideration, but simply to give swift vent to your passionate and emotional feelings, you transform yourself into the ideal audience for taking part in 'Hate Week', and lacking any solid conceptual foundation, you too will hardly skip a beat in venting your emotions, as the label of your hated enemy is switched, from one set of letters, to another... and seriously, why would you think such labels would have any more value or purpose, to those you've put in charge of running the show, than a red cape to a bull?
Again I've got to ask, America, what did you expect? SMDH.