Because it's the same situation with two opposite reactions, decided entirely on his feelings that about consistent moral principles. The fact he had to be convinced to do this anyway shows how his feelings are when it comes to the incidents. His opinion is that being possessed means they should be punished severely, but if it's someone he cares about he'll protect them even when they're trying to kill him. Being emotional is expected, to ignore his past experiences with events like this is not. Having string emotions don't make him right, all that shows is that he has strong emotions - which lead to reckless actions since he's being directed by impulses not thinking clearly. What Scott thinks about Wanda is unknown and its worrying since the last few years have disappeared from his experiences and we know the memories from the resurrection process are being modified without consent.