It's time to go to Two-Hand Touch on the QBs. You can't bar defense from going after them, but at the same time let them escape to create some magical down-field scramble/completion...so...defense gets two hands on QB, he is down.
Or let them get creamed/let them escape.
This is just plain stupid. I've seen so many other plays where if one of the collidants is a QB it would be a penalty, but they weren't, so it wasn't.