Look, I get what you are saying and even agree to a certain degree. Yet, the premise here is that one of both parties is opposed to genocide, which is false. For the affected voter group, who are getting shamed for making the crime of crimes their litmus test, both people are trying to make more holes albeit of different sizes.
So, what would you do? I would probably throw both of them over board ;)
Now that is just plain stupid. One can make a moral argument for not wanting to vote for genocide, since the situation is similar, but not the same(!), as the famous Trolley Problem. But actively voting for the other pro-genocide option because you believed him to be a peace candidate? … This is something that needs honest analysis and reflection. Both by these voters as well as by the Democratic Party. How the hell could Trump with his abysmal record be perceived as the peace candidate by so many? I do expect though, that all the involved parties will learn the wrong lessons from this.
With all the blame, shaming and hate towards Muslim, Arab, African and Latino Americans we should also not forget: The only ethnic demographic from which Trump got a majority is: White voters.