Why would you delete anything? You should be able to block people, or to hide notes you dislike from yourself and/or flag them for others, but why should anyone be able to delete anything? Wasn't Nostr supposed NOT to become another free speech suppression tool?

As soon as you make deletion by moderators possible, it will start getting misused; just have a look at Mastodon where small server “warlords” answerable to no one arbitrarily suppress anything they dislike or disagree with, no matter how truthful or polite it is. It's a bad idea to enable the same behaviour on Nostr too.