Un-PC PC

I'm finding myself in an increasingly weird position as a mum. Things that I thought were considered "normal", or matter of course have been turned on their head. Its been going on for ages. My daughter, when she was at play centre, was continually beaten up by a complete munter of a four year old boy. The reaction, you think, by the adults would be some standing down, maybe a little time out, some time to think about his actions. Several years later, his little brother is beating up on my two year old boy - I can't believe it! This little thug runs through the centre, knocking down all of the resources, upturning puzzles and collage and paint, with little or no consequence. He's beaten up poor R so many times I can't keep count, and the policy at PC to deal with this is of positive guidance - so instead of telling M off, of showing him how much he has hurt someone, he is gently led off to some other activity that may better serve his purpose. Ultimately to me, over the four years we've been there, the result is almost creating an environment that says its ok do these things, because there's no real consequence to their actions. Don't get me wrong - Playcentre can be an incredible environment, so free in spirit and full of adventure and learning, but what has happened over the last decade(s) to make this other behaviour ok? I guess I'm about to learn what having a rumbuncious 3-4 year boy is all about anytime soon. But for me, I still wouldn't let that kind of behaviour be ok for him.