people are conditioned by all the vicissitudes of their daily lives
if you're not against drinking alcohol, for example, you obviously haven't experienced (or witnessed) just how destructive it can be, like i have. i would make the argument: if one truly understood how stupid of a choice it is to make yourself dysfunctional via intoxication for recreational purposes, no one would ever drink alcohol, or use any drugs at all.
so anyone who does clearly doesn't understand.
and if they do understand, and they just don't care, then, i'd classify that person as a fucking moron--plain and simple
point being, this is an argument i'm making from personal experience, as well as from my own personal set of values that i've developed over the years--either consciously or subconsciously. i am the sum total of everything that happens around me. invariably, many of you will disagree with what i say, based on the twists and turns of your life that determined who you are today--and yes, i do speak of determinism.
the subconscious development of one's personal values is a form of psychological conditioning--the aforementioned twists and turns of life that make all of us conditioned in our own unique and ugly ways
forgive me if i'm not very lucid right now, i'm quite bushed