Moving on from death fantasies...
"Their house, their rules" seems asinine to me. Do we say that when someone shakes a baby to death for screaming too much? Their house, their rules, right?
Is that your response when the Taliban put people to death for being infidels, or not wearing a burka, or something like that? Their house, their rules, right?
There is what is right and what is wrong. I don't have any interest in drugs and no use for drug dealers (or most users,) but I also understand that there are right and wrong ways to treat people. To be honest I don't have much use for drug laws, my view being that any law meant to protect people from ruining their own lives simply creates a criminal underclass, costs taxpayers billions, and doesn't really prevent people from ruining their lives anyway.
I've known several drug addicts in my life. Never for very long, for obvious reasons, but they were losers before they got hooked. If you don't want your kids doing drugs, raise them to be self-confident, self-reliant and rational. The govt's laws won't help you at all on that end.