If one were to accept your premise that Trump = Clinton, which millions of rational people do not, including the smartest people on this board.
If one were to accept your premise that voting for a lying flip-flopper is rational, which basic logic says it's not, and if one accepts your premise that just about everyone on this board, save the few Trump worshippers, is stupid.
My premise is based on facts, on Trump's actions and his affiliations, and on living in NYC for 13 years where I got to observe Trump and his political ilk up close. So yeah, based on facts, not wishful thinking based on nothing but Trump's lies, I mean truthful hyperbole, my premise is that in all relevant particulars Trump = Clinton.
You disagree. Fine. I'll even give you the (giant) benefit of the doubt and assume you considered the same set of facts. The fact that you came to a different conclusion does not give you the right to say I'm irrational because I disagree with you.
However, since Trump keeps backtracking on his promises - a virtual wall is not a wall - and since he has freely admitted in writing that he lies in negotiations to get what he wants, you're not really entitled to a lot of benefit of the doubt. It's not rational to unthinkingly adhere to someone who continually changes the specifics of his alleged policies.