If you used the pk that should have been called as the basis, I would get it. But no one deserves to win just for attacking but not scoring. That means you are just ineffective.
It has been Arsenals issue for a while, passing around neatly, finding little space behind a deep defence, get off few shot (tell me actual free open chances they had last night? Hardly much, they have issues finding them with that kind of defence). They shouldnt get win due to effort and flashy huff and puff, but get what they deserve by actually finishing well (thats why you are saying they deserve to win two times over, believe me of all the EPL teams they are my favs, but deserve this or that is hogwash). If you dont, then you deserve shit.
Its like saying Roma deserved something out of the Man U game for passing around neatly but getting nowhere.