I agree with sheik. The law is there, mandatory death for drug trafficking (depending on the amount), dude went in the biz knowing exactly what he's got himself into. Whether he needed the money or if people do stupid things when desperate etc is redundant, these are things you know and consider before anything else.
I'm sorry, but I have zero sympathy for the guy. The argument that capital punishment for drug trafficking is too harsh is a different altogether. Personally, I endorse it. One way to look at it is of course it increases the value of the drug as someone mentioned before so it could backfire but I do believe reinforcing this could help reduce drug trafficking. I will look for stats if it supports this theory, but I'd imagine it's too big of a risk for anyone to simply go through it, hence the numbers would be reduced.
@King Mauricio - not true that they just 'choose' who to persecute. How your friend got caught, whether someone ratted him out is not the court's business, but malaysian courts have been very harsh with drug traffickers, they don't take to it kindly; foreigners or no. look at the barlow and chambers execution.