Yes, because it is a well-known fact that only potheads defecate in parks!
When I was a kid (in the 1960s), there was a part of town where the winos hung out. You know: Those grisled, 65-year-old panhandlers who obviously looted "Goodwill" boxes for their clothes. The ones who, with slurred speech, would proposition ten-year-old kids for a "roll in the hay." Who slept in alleyways...
So, I guess that you're right and they were all actually marijuana smokers, not winos.
Regards,
I thought that was postal workers? Oh, that's in peoples side yards.