The guy trying to run the interception back for a touchdown after time had expired? That was at worst poor taste. Worth a grumble, but not even public mention.
The whistle hadn't blown. The play was still alive. The guy could have gotten up and run.
The refs admitted they "made a mistake" in not blowing the play dead.
Still & all, you're right, he could have just "touched" him down. But at least his infraction occurred DURING the game........umlike Kleinsasser's unprovoked attacak on Marcus Anderson, which started the whole brawl after the game.