It’s a lot easier to correct bad policy within the framework of a liberal democracy than to reverse democratic backsliding. 

If Trump wins, the US starts down an unprecedented authoritarian path. As a I learned it the hard way in my native Hungary, one must vote for the winningest opposing candidate in a situation like this, no matter how misguided their policy, just to preserve the rules of the game.

You don't get a louder warning than this

https://www.nbcnews.com/politics/2024-election/13-former-trump-administration-officials-sign-open-letter-backing-john-rcna177227