[NIP-01] Event validation

[Sgiath]

I noticed there is no mention in the NIP about the validation process. Is it intentional? I recognize that bad-faith relay or client might intentionaly publish non-valid signatures so nobody should be relaying on any third party about validation but I feel like there should be at least mention about it in the NIP. Something like:

Relays SHOULD validate the sig and id of the event and the event MIGHT be rejected if the validity cannot be established. Clients SHOULD validate the sig and id fileds of any incomming event and it SHOULD reject any invalid events or visually idicate to the user that the events are not valid.