What probably bothers most defenders is that they have to spend time learning to counter it. That's why we always hear about how risky it is, but hardly ever see injuries from it.
Jets coach Rex Ryan has used what he calls a “big ball drill.” The exercise, done throughout training camp and periodically thereafter, entails pushing a large ball into the legs of defensive linemen as they try to stay on their feet and simultaneously push the ball away. It worked so well during Ryan’s time as defensive coordinator of the Ravens in preparing linemen to face teams that use cut/zone blocking that Ryan proclaimed he should seek a patent on the technique.
Bottom line? It’s not as big of an issue as the Steelers and Titans have made it out to be. And the best way to deal with the situation isn’t to complain about it, but to find a way to overcome it.