MDMA == Molly. Maybe your friend was stupid to begin with? MDMA is very much like weed, it's effects are 100x that of a sativa strain in my opinion. Like cannabis it is pretty safe. Like cannabis you can get stuff with shit mixed in. LMA often gets sold in the place of MDMA. MDMA is pretty safe, only the tw*ts who use it frequently get messed up, this is the same with cannabis. This is like anything in life, if you eat too many burgers you become obese, if you inhale pure oxygen, you can die. Considering the power of MDMA you aren't supposed to take it (IMO) more than once every 1-2 months. When you do drugs you need to do them safely. Good job on calling your friends idiots tho.
Edit:
I'm sorry but, this is plain stupidity, I am a fan of cannabis but your argument is pretty petty.
The US owns a patent. This patent allows the use of Cannabis medically. However it disallows scientific research of cannabis (its illegal). Therefore; there is no official research as to why cannabis is harmful or as to why it is good. Saying this...I can say that cannabis is bad, and you can't give me any official research to say otherwise.
More ontopic. I agree with OP. Weed should be decriminalized-(&legalized), regulated and taxed. Crime goes down, the economy and state of living improves.