How come Charlie Sheen keeps getting a p? Why not jail time?

He seems to just break the law , have and take drugs and yet he gets a slap, a few weeks in rehab and he is right at it again. He could be killing people driving around high , he is influencing young people that it is ok to take drugs and hey, nothing will happen to you. The excuse is always what a nice guy he is to get back to work quickly so that the cast and crew of his show don't suffer financial hardship. What a crock! What say all of you?????