I can tell you why they do not eject offensive linemen like defensive players do for targeting, because they want to put on an offensive exhibition. That’s what they want.
They let the offensive linemen use their head and hands a whole lot more than defenders. If you loose your wheels, you’re done. You’re finished. It’s real obvious to me that they allow the offense to do that. They allow the offensive linemen to step off the ball, and the first thing they do, they grab a hold of the defender and hold on to him.