Hitting and Kicking

Why or why does it seem like a good idea to hit and kick each other? The kids seem like that is perfectly acceptable for them, but what if I started doing it to them? Yea, that’s right not so cool anymore. Seriously, we try and try to get them to stop with little luck. Dinner was a disaster today as two boys could not keep their hands to themselves. Anyone have any ideas? We have little ideas of disciplining but take them away from the group and talk to them. For some kids it works better than others. We also didn’t give them bananas when they hit each other (bananas were for dessert), and for me that would have worked instantaneously, but I guess it will take more than not giving them fruit…