Maybe because the heroin users that you know aren't responsible, the responsible heroin users would NEVER let you know that they're using. I used heroin 3 times a week for about 5 years and worked in the medical field, I would snort a line when I got back from work to relax. I never got addicted, I never fiended for it, and when I took a couple of months off to travel I barely even missed it and I certainly didn't crave it. I would have half a gram just sitting in my drawer and no matter what I wouldn't touch it unless it was on the 3 days out of the week I allowed myself.

Only about 23% of people who try heroin get addicted https://www.drugabuse.gov/publications/drugfacts/heroin I completely stopped using it when I moved to a new state and didn't want to deal with the hassle of avoiding drug tests for work and was trying to have a child. Heroin is the overrated big bad boogeyman of the drug world. In reality pure, clean H is no more harmful than alcohol or prescription pain meds. The accountability is on the user, not the drug. I will say though that the people who cut H with fentanyl are gigantic shitbags.