Not sure what you're seeing that would make people leave, but there is a price for freedom of speech. You just can't have it both ways. Even on completely controlled platforms, things slip through all the time. Nostr's tools will get better, but there will always be things people don't want to see. If people can't handle that, it's their problem.
Discussion
The tools will get better if we demand better tools. That is what I am doing.
Do not discourage people from asking for something better, just because the result will be imperfect. Do not shame women for complaining about being mistreated or tell them they should just get used to the abuse or GTFO.