No one said you did, but it is an excuse. There is "no looking at what brought him to drugs."
I understand where you are coming from. To solve a problem you need to understand it. But this problem won't be solved by understanding what brought him to do drugs. There is no clear path to shooting up heroine. Was it peer pressure? Was it depression? Was he just curious? Doesn't matter. The fact is he chose to do it.
It's the same as if someone stole a pair of Jordan's. It doesn't matter if the person was poor or not, the fact is that person stole them. They didn't need them to survive so there's no point in figuring out why. It was wrong no matter how you look at it.
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Because they are not the same. People don't choose to shoot themselves up with cancer cells....