It is this simple. Voting for Republicans now enables racists and the far right violent fringe
There is no need to argue over whether everyone who votes Republican is a racist him or her self. There is no need to argue over whether or not there are some decent Republican politicians out there. For all but the most local of elections, where State and National issues seldom are relevant, and where most voters know the candidates personally, November 6th is a referendum on the future of our Democracy and the type of people who we aspire to be as a nation. Trump insisted on making this election all about him, so now in fact it is.
Everyone who enters a polling booth should be clear; Vote Republican if you agree with what Trump is doing to the fabric of our Democracy with his constant anger, insults and hate, or vote Democratic if you don't. Republicans need to lose for the latter message to prevail.
Between now and election day I'm not going to argue with anyone I may meet over whether all Trump supporters are personally racists etc. I will simply state that all those who find any reason to back Trump now are enabling the racists and anti-Semites, and the steady slide of America towards authoritarian rule and a violently divided nation where anger overwhelms all reason.
I will say "Go look for decent Republicans later if you must, this year Democrats must win."