Young Kids and Heroin-Why?

Why the fuck are young kids doing heroin-and dying from it-it makes no Goddamn sense.
They see friends die,they know they are either going to die,or go to prison,but they keep doing the shit.
Offer them all the help in the world-and they just keep doing heroin-it’s all they care about.
When family members don’t hear from them,they get worried,and usually find the kid with a needle in their arm,or like my son in law-the cops gotta kick the door,then they find an already decomposing body with a needle still stuck in the arm.
Then the coroner tells the kid’s mother she can not see the body-it’s too bad,has to be cremated,and/or  has to be closed casket funeral.
This makes 6 people we know who have overdosed in the past year or so-all but one were the kids of our friends.
These kids see their friends dying-they go to the damn funerals-yet they still do the shit.
I’ve taken every narcotic there is for pain over the past 8 years-and never had the desire to take a bunch of extra pills just to get high.
I just don’t get it-these kids know better-they know how it ends.
This was a great kid when he wasn’t doing the heroin-now he left a widow,and a baby son with no father-and his mother and father who are devastated-just because he put getting high above all else.
I just don’t get it.