Non-forfeit debates are essentially a popularity contest.
I know I'm not popular on here because everyone from both parties pretty much requires 100% agreement with your politics in order to like you.
If you tell a democrat, "We should cut the military budget, and BECAUSE OF THAT, we should stop funding Ukraine.", then the democrat thinks you're a fascist enabler (which I'm fine with that title because ad hominins don't work on me).
If you tell a republican, "Picking strange men over bears dehumanizes men but it ALSO dehumanizes people to view Haitians as eating pets in Springfield.", then the republican thinks you're a socialist enabler (which I'm fine with that title because ad hominins don't work on me).
I know I'm highly unpopular here.
Therefore, if I debate with a left winger, then the right wingers won't turn out to vote for me in a non-FF debate because they hate my guts (vice versa applies for if I debate a right winger). But the opponent's respective party will turn out for them. It pays to be a partisan hack. It's in one's personal interests to be a partisan hack. You get more votes; more of a social group; people care about being socially accepted more than being correct.
It's just immoral for me to do this, but I also don't want to lose debates when I clearly made the better argument, but everyone that agrees with me doesn't turn out to vote for me because I pissed them off on some other issue.