I'm for a fair amount of leniency when everyone is being civil, but the line needs to be a bit left of card carrying Nazi.
Anyone advocating against human rights should be banned, because such debates are not fruitful. For example, some of the rhetoric around exterminating the homeless in Fox news has no place here.
Fwiw, I think the fediverse gives bans far less weight. A safe and informative community with a range of opinions on how to improve things should be the goal, and mods should be bam happy to get there.