Why can't I do that, yet keep those drugs illegal?
You can---but why would you?
I would be more inclined to hear your argument for drug legalization if I didn't have to support the drug user.
Are you likewise less inclined to support alcohol's legality because you have to support the alcohol user?
Did you think that my only objection to legalizing drugs was the fact that they are a financial burden on the rest of us?
This question has been answered my me in numerous other posts over the years. That's where you'll find my answer.