This amounts to blaming the victim. You're asking this guy to compromise his principles and vote for people who are complete louts just because they're not the other party's complete louts. That heinous, dude. Good for this guy making a principled stand. The lesser of two evils is still evil and voting for the lesser of two evils is how the US got into the shitty situation it's in.

This guy is not the problem. He's not at fault. He's a victim, the system is rotten, it won't be changed by more of the same, and trying to convince a principled person to vote is very similar to trying to convince a battered spouse to stay in an abusive relationship "for the children". HELL NO!