Do I entertain the possibility that Trump could win another term fair and square?
Of course.
The same way I entertain the possibility of a giant purple horned elephant spontaneously appearing in my back garden any moment now.
The laws of the universe technically allow for both to occur.
But neither events are particularly likely, especially in the case of Trump, given he would have to rescind, mitigate, and/or fully correct the many corrupt, destructive, subversive actions he and his camp have already taken just to arrive back at a neutral state allowing for a “fair and square” victory. Not to mention needing to acknowledge and take responsibility for quite literally thousands of demonstrable lies that have unduly influenced many things, including the lead up to the election. All before November, without doing anything else like it afterward.
And I think it would be woefully misguided to claim equivalency of power to subvert a presidential election between a political entity seeking office and the vast apparatus of the sitting President of the United States, after he has effectively assumed control of nearly every department and agency of the executive branch.
Anyone earnestly arguing equivalency is either ignorant of systems of government, have not been staying abreast of recent events, or is being intellectually dishonest for their own purposes. Even posters in this and other threads that hate Biden, Harris, Clinton, and so on would not argue they have the same powers as Trump to improperly influence the election. Nor that he has not been attempting to do so already.
And, as you brought it up: the better part of rationality is understanding what is possible (nearly anything) versus what is likely (a considerably smaller universe of possibilities).
But this is really a discussion for the Trump thread at this point.