@folkerschamel @SallyStrange @samuel @steve
One good Wikipedia article deserves another… if you must know why instances must block other instances:
https://en.m.wikipedia.org/wiki/Paradox_of_tolerance
Unfettered tolerance leads to rampant intolerance. It’s basically a choice between intolerant groups that would quash any that disagree with them, and tolerant groups that are willing to work with others. Being a part of the Fediverse means accepting a social contract of sorts to play well with others. If an instance isn’t willing to do that, it needs to be blocked to preserve the rest.
(This is also why, when Musk claimed to be a “free-speech absolutist”, most of us called BS.)