Sad to see, no doubt there are underlying problems that have caused this guy to go a bit wild, and the Forces should do all they can to help him.
However, would any of you really be happy to get into the back of an aircraft that is being flown by someone who has openly bragged about taking class A drugs (or any drugs for that matter, inc booze if it is still in your system), possibly at low level & possibly in a combat zone?
As members of the forces, and involved in aviation, we have a duty to each other to be at the top of out game, certainly as a maintainer & licenced engineer I would not be willing to jeopardise an aircraft through impairment of substance abuse, or tolerate colleagues who would. Military aviation is dangerous enough without avoidable dangers, we all know the rules when we sign on the dotted line.