I recall it took a while for the college guys to stop spearing with their helmet. It's a much safer game since this rule. The NFL should have started this rule when college accepted it and even though it originally wasn't thought out well, what we have today is so much safer. Getting thrown out of the game has been a motivating factor to conform sooner rather than later. I don't think NFL players can be thrown out. If I'm not mistaken, it's just a 15-yard penalty. The NFL is bad about leading with their head, getting tossed would be more punitive and educational.