There's a feedback and suggestions forum, you have a better chance of reaching mods there. I'd say the reason why psychotropics was deleted and no further talk is allowed is one of these three reasons.

1. There are a number of kids on this site. Since this is a pro-cannabis site, cannabis talk has to be allowed to everyone for the novelty. However, talk of harder drugs and experience with minors could put the owners of this site in a real hot spot. Cannabis has never killed anyone. What happens when a kid from this site gets some bad shroom or opiate information and OD's or poisons himself? You and I both know how much CBS loves to blow things out of proportion, no reason to feed into that fire.

2. Why are the only banners for a cannabis site cannabis related? Because most companies don't want to present a pro-cannabis approach, since it is still illegal. It would be easier for a "make-your-own bombs" website to get ads than this one. Of course, deleting the psychotropics section and making it so no other drug talk is allowed, cannabis.com shows a stronger approach, and may be able to pull in more advertisers from companies who sell ad space.

3. It doesn't fit into the business motto. It's hard to say you're presenting only a pro-cannabis approach when your users talk about all kinds of other drugs. This is probably the least likely reason, but still.