Well yes there is plenty wrong with doing ecstacy with your friends. It fucks up your brain and body. Friends don't help each other do chemicals like that. It leads to death, mental problems, social shaming etc.

Depends on how you do it, and how you use it, surely?

In more enlightened countries (not China!!) they have drug testing and counselling and education. Much like there is no sex education in China, that causes problems. I heard one chinese guy tell me that he doesn't worry about having sex, as healthy people don't need to worry about getting sexual diseases. I asked him how do you know if someone is healthy just by looking at them? Total failings of the education system, a ticking timebomb awaits them......

Education is the key to moderation and prevention imho, not burying your head in the sand and hoping a problem goes away and refusing to discuss it. Like portugal for example.