No one ever believed Jets 'change' It's absolute bull crap, go die in a hole fascist communist nazi jet *ahem* sorry I don't know what overcame me there. Don't do jet kids.
Yeah, I think that by 'killing jet' the makers thought they could redeem him, like if he died for a good cause, but some people are just too bad to be redeemed. Also, they do make a great joke about how confusing jets death is later XD
Remember: when people tell you something’s wrong or doesn’t work for them, they are almost always right. When they tell you exactly what they think is wrong and how to fix it, they are almost always wrong. — Neil Gaiman