composition 4E the law should be change so that childreen over 12 can be responsible for a crime

Always I see childreen with less than 18 years shoplifting, mugging, vandalisming or robbing and they now what they're doing or what are the consequences, but they never are sent to jail because one thing: they're not 18.
First of all, the should be change so that childreen over the age of 12 could be responsible for their crimes 'cause if not, we will be creating new drugs dealers, killers, bank robbers and many bad people such as bullys too.
on the oder hand, we will be scolding childreen by an agresive way, and some of then might create phobias about the police or prision.
however, in my opinion, I belive that this is really the best way to give them a corrective so that it's really difficult to a child, after all that, back to the crime.