Okay, what happens if I try to sell you random substances and the authorities dispatch police officers to stop me and I do not comply because I want to exercise my right to trade with you? I can tell you. Violence.
If you disagree with me again, I am going to punch you, but it's not violence because I'm not doing it if you don't do it again ;)
So you don't deny that enforcing a ban requires violence, thus a ban is an extreme and violent stance to take and only makes sense if there is evidence that harm can be prevented, which was my initial statement.
If you disagree with me again, I am going to punch you, but it's not violence because I'm not doing it if you don't do it again ;)