The very purpose of a censorship-resistant communications network is to permit some forms of "illegal and dangerous" content because "illegal" varies with time and jurisdiction and "dangerous" varies with time and culture. Nostr doesn't host non-text media, websites do. I am not trying to minimize the real issue at hand. My suggestion is not about nicely and politely. I suggest we build incentives into clients and relays for people to honestly label their content. Those who do not label at all can be easily exiled. Even posts without a label can be easily blocked. Those who label dishonestly can be (admittedly less easily) exiled.