Any of that could be true.
Even item "e" could be true but not in the sense that he's hiding something about himself that we the people wouldn't forgive. I have to admit that in America we can be more than a bit provincial, thinking we are the only true power in the world. But there are other types of power, and a lot of powerful organizations out there that transcend nations. They may not be ultimately more powerful than the US, but powerful enough, and in enough ways, that US political affiliation doesn't matter to them in what they do. If a group like that is involved, or multiple groups, then our very provincial way of looking at this issue is blown right out the window.
Why didn't you care about those items when Biden was POTUS?
Probably because he wasn't mentally competent enough to speak spontaneously and coherently, for even 30 seconds.
I'm on board with all the criticism Trump is getting over this. I just wish, as always, that the media and the sheeple could have a little perspective on it.