Don't worry, after your use of harsh language while he's running away, he'll reform and never steal again. He won't learn to pick a weaker more helpless victim, either, like a 90 year old lady who will die from being knocked to the ground trying to hold on to her wedding ring.
All will be well.
So, Joe kid, age 11 comes onto your yard (obviously to steal your son's bike), you chase after him and shoot him in the back two blocks from your home?