You aren't very old,are you?
Yeah, I'm older...old enough to have seen the corruption, the racism, and general futility of this "drug war".
No...it becomes our problem,when they harm/rob/destroy/kill others.
That's why we have laws against driving drunk, have laws that restrict people from bringing firearms into bars, have laws against robbery etc...
Now ask your self why, in drug related matters, would people "harm, rob, destroy and kill others?