When you start having shootouts, I think that's the perfect time to draw the line. But not everything is that serious.
With regard to Roethlisberger, I am uneasy about punishing him for something that never got past the allegation stage. Charges were never filed. He most certainly was never indicted or prosecuted. Sexual assault is a big deal, but the truth is the guy got punished for never being charged with a crime. I find there to be a problem with that... after all, what happened to innocent until proven guilty?
Roethlisberger, by a lot of accounts, seems to have some major issues. If he did do as was alleged, shame on him. But I do not condone the NFL going after someone when the law didn't. The Duke lacrosse situation should have taught us to be careful before we jump the gun on all allegations.