Being able to delete things
Discussion
You can in most clients... I'm guessing you mean actually having a guarantee of sorts that the event is deleted on EVERY relay?
Yes.
Not gonna happen. Relays aren't yours, they're someone else's. You don't get to dictate how their machine works.
I don't mean this to be adversarial. It's actually a good thing. If this was somehow enforced, Nostr would cease to be an opt-in protocol and would start to be something more like a global consensus blockchain, and that is undesirable.
If you _do_ prefer a consensus-based social network, those are already out there.