Yes it is pretty ignorant to ignore all the devastation and other problems that drugs bring to neighborhoods, families, and communities.
What's fascinating is I know you mean 'drugs other than alcohol' but in reality it's the drug alcohol which probably causes the most devastation to neighborhoods, families and communities. In total, nationwide, there is no question the societal burden, the devastation, from alcohol abuse is FAR, FAR higher than for pot, several orders of magnitude higher, and it hits families rich, middle class and poor. As far as health goes, legal smoking of tobacco sold in any convenience store is by far the biggest threat to public health, consumes the most dollars. Lots of studies referenced here directly related to the pot issue:
Alcohol or Cannabis? No Question Which Substance Poses a Greater Risk to Health
stating your opinion as fact is a fallacy.
The fact is that drugs are illegal because they do way more harm than alcohol does. don't
believe me then go walk any drug invested neighborhood and look at how prosperous it is.
There are several errors in those short statements. The first is treating alcohol as something other than a drug - it's just a different drug. Second, I've looked and never seen a study that finds that drugs other than alcohol do "way more harm" per use than the drug alcohol. When it comes to alcohol versus pot, the findings are from what I can tell universal and definitive, across many countries, that pot is far LESS harmful than alcohol, for several reasons.
Other drugs are clearly very harmful - meth, opiates are obviously killers of many - but that's not an argument for treating drug use and addiction as primarily a criminal issue (our failed War on Drugs) rather than a public health issue. Legalization doesn't solve all the problems - see, alcohol, nicotine - but the goal is to reduce the health and societal problems of drug abuse, and it seems clear our criminal approach just doesn't work. It's like whack a mole, except we fill prisons with a never ending stream of non-violent users and dealers, and many of the rest are there for violence directly caused by criminalizing sales.
Finally, when you talk about drug infested neighborhoods, what you (probably) mean are poor areas of the inner city filled with poor and often desperate and dysfunctional people. I've never seen studies on the issue, but it seems safe to say drugs are primarily a symptom and not the cause of the problems you see.