the list instance being full of hate is just a symptom of allowing right-wingers to host their own platform, moderating joinpeertube.org is only a bandage fix
unfortunately there is only two ways of truly fixing this problem:
don’t make the software free (free as preached by the fsf) by using an ethical license
take away the rights of these “people” (would required heavy government intervention so there isn’t much you can do for now)
the list instance being full of hate is just a symptom of allowing right-wingers to host their own platform, moderating joinpeertube.org is only a bandage fix