He punched him twice. Suggesting that the level of damage of each punch needs to measured is legitimately stupid. It's illegal.
Calling it "provocation" is silly childish shit too because adults control themselves. He taunted them. Bear in mind, this was after they also said some shit about him. That shouldn't have to be mentioned because our shouldn't matter, but by your logic, the fighter could have won the fight and then instead of taunting, just attacked Sean after? This is Strickland we're talking about here, you realize that, right? Every time he says some dumb shit, people can just charge him and start punching? Because "cage fighter"?
And frankly, saying "because they're cage fighters" doesnt mean anything either. The fight was over. The reason charges didn't happen is because the fighter didn't want any. The Conor deal is a different story because he wasn't at the event under license by the commission, so punishment is more the UFC's Code of Conduct for it's fighters (which they weren't going to do because Conor is their trophy baby) and actual charges came from law enforcement, which could also open Conor up to civil cases. The commission is like the 3rd/4th most important organization in that realm, so they deferred.
This is a "We have given you the express permission to work this event" and Sean went, "Cool, lemme fuck that up and break the law cuz pro wrestling taunts make me mad." Of course the response should be, "Yeah, we're not gonna issue any permissions to you for a while"