At least I don't want to spend much of my brain power deciding what individuals to block. I prefer there's a moderator who thinks roughly the same way about things things as I do. It's better not to be overzealous with the moderation: I am okay with a little bit of manual curating of my feed, but the things most obviously unacceptable to me should be banned by the instance.
Also: If a lot of people see the messages of ICE, I am not really likely to ban them either, because I want to know what is going on in the world around me. But if I know they are being banned by a lot of people because whole largish instances are banning them, they no longer are goin on in my part of the world. At that point it becomes more of a choice to want to hear them.
Not in US politics. If you have 51% of votes of whoever is The Party at the moment, you can make decisions without others impeding on them.
If one party got 51 % of votes, then that means 26,01 % of all votes is enough to decide about the all of the country's things alone.