So of all the terrible things Trump has either said or supposedly said, the one thar broke the camel's back was there's an enemy within? I'd say a majority of the country thinks there's an enemy within. The only question is who they think that enemy is. I do agree with you that the timing if the story doesn't make it less damning. But it does make it less likely it's true.
My logic on more people speaking out against Trump might be wrong, but it isn't flawed. Remember my opinion is that Washington is full of corrupt people. Why would i want corrupt people to side with Trump? It's possible I'm wrong and there's not mass corruption in Washington. But it's not flawed logic to think it's a good thing that corrupt people speak out against a guy who is trying to end the corruption. In my mind it would be way more damning if Washington was backing Trump.
One thing Trump said that really gives me some hope is he said his first term he didn't know anybody and was convinced by lobbyists to hire certain people who weren't good hires. He says he knows everyone now and will hire people who aren't corrupt. He also said (and everyone on both sides has to concede this is true) that he had the guts to fire people and when people get fired they say bad things about you. He pointed out during the debate that no one got fired for the Afghanistan withdrawal. If Biden would have fired someone, do you think that person would have good things to say about him right before the election? If he wasn't pushed out I mean.
Kelly is a military man with an exemplary record. His account is backed up by numerous sources, and it echoes similar accounts provided by many more of Trump's cabinet members and staff. These are all Republicans, by the way. For the life of me, I cannot understand why people think Trump is the one to be trusted; he has decades in the public eye where he has consistently proven himself to be a conman, and his self-interest in lying is evident. What self-interest do Kelly, Mattis, Milley, Esper, Bolton, etc. have to lie? You can come up with some conspiracy-driven motivations, but the most simple explanation is that these lifelong Republican public-servants truly feel like Trump is a reckless and incompetent leader.
To the bolded part, it is not the "enemy within" language, it is the rest of the rant. Trump explicitly proposed using the US military to take care of radical leftists who do not agree with him. All of his surrogates argue that isn't what he actually meant, and whenever Trump has been given an opportunity to clarify or walk that back, he doubles down, he truly believes the US military could and should be used against US citizens who do not agree with him. So yes, that unconstitutional suggestion would be expected to rankle a career military man who has fought to defend the constitution and the American people.
And no, I don't think most Americans believe there is an enemy within. Trump is a buffoon, a likely criminal, and a horrible choice for leader, but he is not an enemy. To the extent his criminality is proven by a court of law, he will need to face consequences, like any other US citizen. But I do not support extra-judicial action carried out by the US military against he and his supporters.