It is not illegal to talk of, and organize around, hateful and morally reprehensible beliefs. If they act on these beliefs or create credible plans to act then

It is not illegal to talk of, and organize around, hateful and morally reprehensible beliefs. If they act on these beliefs or create credible plans to act then that would be the line. We also have civil authorities - like the police - that we bestow with the power of violence to protect these lines. Additionally, we have civil rights and hate crime laws that bestow additional punishments for groups like this acting on their beliefs. I think we will be better served reinforcing our shared beliefs in these civil authorities rather than acting as vigilantes and undermine our moral stance and possibly reinforce/embolden the support for our enemies.