I don't think you understand, but not your fault really. It's a difficult thing for someone to understand unless they've experienced it themselves. That's why they have Al-Anon and entire support groups for people who care about addicts but are not one themself.
Ask yourself why people commit suicide. Saying "just don't do it" doesn't really help much, does it?

dedicated my life to it.
I'm not an addict, but I really feel you guys, and I want to do what I can
Many feel so, like they are worthless, and the only enjoyment left in life is what destroyed their life in the first place.
Trapped in black & grey existence. Worst part that the depressions get even worse when they're not taking drugs anymore. It's so hard to find a way out of this tunnel. That's why I do everything to be a light to the 44 people I care for atm.
Also trying my best on this site, but it's much harder to knock down the resistance via text and in a foreign language,
and there's a huge movement on this page that is blindly pro-drugs without seeing any consequences whatsoever,
hard to fight these. I tried much more when I started on this site, but mostly stopped helping because usually some other user who is not OP is going to hardcore contra my (professional, btw) opinion of how they should get off drugs, and my explanation of how to attempt doing it, or if they want to use the drug attempt to use the motivation to do sports and create body-own drugs to drop the drug asap, or my favourite advice to try a medication and drug-free path, etc, and having to fight these negative people is too exhausting, so I only rarely do it here now..