Sometimes the risk of getting caught, and facing the death penalty, seems less than the risk of not trafficking drugs and then having to deal with those consequences.
There was a case a few years back where an Australian trafficked drugs in a SE Asian country because his brother owed some dealers money and they would hurt his family if he didn't mule for them.
For him, under those circumstances, the risk was worth the reward of protecting his family.
Im not condoning what he did, but that showed me that sometimes people will resort to trafficking drugs for various reasons, even though they may die if they get caught.
Everyone has their price. For some, it is for money, others it is for family, others for their own addiction.
And because everyone has their price, the death penalty will never totally eliminate a crime, it will just drive up the price/reward for people to take the risk.
Governments need to target the manufacturers and be harsher on them, not the mules.
I sometimes think about that kind of situation, and I always come to the question of "Why not tell the AFP and then request some kind of protection for you and your family?"