If it was a swastika or the n-word I would be very concerned about the nature of the community in that neighbourhood and if I'm in danger. But in terms of how i'd deal with kids seeing it, I'd take it as a teachable moment. I don't have to hide my kids from everything I don't believe in (besides they probably see crazy shit online anyway), I just need to teach them how to deal with it. Anyway, theres a wall near where i live where someone has made a massive mural making a political statement. People keep defacing it with the opposite opinion, and people keep painting back over that. If you really need the authorities to tell your community that swastika graffiti should make them angry and call them to action, then your community is screwed already. Either way, yeah just as we have laws to deal with incitement to violence and hatespeech we can have that with walls if you'd prefer, it just has to be sth actually extreme and targeted.