What do you mean we have to take care of your children while they're in our care?"?

I have 3 children. My oldest is 10. He's a good kid but sometimes loses his mind and does things that he knows he shouldn't do. When this happens, he gets punished. Whether it be grounding or whuppin' (I'm southern) he gets punished and then he gets his mind back and starts acting right. Same goes for my 6 yr. old. Now we will start with my 10 yr. old. He started having behavior problems in kindergarten. I punished him at home and I talked to the teacher and the principal and asked them what they were doing to punish him at school for his behavior. Apparently, they put on a really nice face and smile real big and tell the children...please don't do that anymore..when what they're supposed to do is hold a conference then detention then exclusion (no recess) then SAEP( in school suspension) then corporal punishment (paddle across the azz) but that isn't what they do. They blame the parent even though the parent is the one going to the school almost every day because..there's more