It's more complicated than that my dude! It is not only a medical condition but it can be brought on by various socio-economic issues, among other things.
A good example of that are the victims and families of the Residential School System here in Canada
https://en.wikipedia.org/wiki/Canadian_Indian_residential_school_system
Some of the survivors were face with years of abuse, neglect and experienced continuous traumatic events. The victims lost their identities, culture, language, etc and thrown into a world they knew nothing about and left to starve/die. Some of these individuals later on in life turned to drugs and alcohol as a way to cope in a system/society that treated them like crap and didn't believe what had happened to them was real, and even if it was nobody cared because they were indigenous. In turn, some of these affected individuals had children, these children's lived in families/communities riddled with addiction issues and crime. The kids, were now growing in a similarly messed up environment and so did their children, and so on. Obviously not saying this happened to all of them, but we still see it today in our communities. I see it a lot when I respond to medical calls, the grand parents are gooned out of their mind, they called 911 for their child who are having a medical emergency due to drugs/alcohol, all the while the patient's kids are just chilling watching mom convulsing on the ground with a look on their face saying "bruh, trust me I've seen worst".
It's easy to pass judgement when you are not affected by it.