You should hate them. GOP will just genocide harder. Vote the GOP to oblivion until they won't rise anymore then the dems are the "right wing demons" where they belong. Then vote more progressive. Rinse repeat until we live in a solar punk society.
You want to hate the guy for pulling the lever that leads to fewer deaths at the expense of allowing the one who will ignore the lever and allow for the most death.
The problem in conversations is that there's a serious dissonance stemming from different individuals (forget about groups even) defining "lesser evil" as well as what constitutes "hate" and "condemnation."
The issue in any event is one that people familiar with the space are accustomed to -- leftists are, almost without fail, absolutists unable to conceive of policy because of their conviction in the correctness of their esoteric political philosophies. It's a group where second-order thinking is heresy because it may call into question a talking point which has been adopted as doctrine and which one must be seen as espousing lest they lose their status as a member of the group.
There's a reason that progressives have been so successful around the world, while leftists are stuck posting in insular online communities or preaching to the already converted when in public.