Shut down by whom? The Nostr community is like the whole Internet or the Dark Net. If you want classy Nostr by your standards, run your own node and moderate it how you please, or find one that filters everything that triggers you. I understand your concerns, but with freedom comes the responsibility to understand that there is no government or company that protects you from content. It was your choice to use a decentralized censorship-resistant network, with all its freedom, but also with all its consequences.