I have had the same experience and agree with you completely. Marijuana users are typically much easier to get along with. I have many long term friends and family members who are pot smokers. They are for the most part easy to get along with. Unfortunately, at this point in their lives many are starting to have severe health and cognitive problems that I believe are associated with their marijuana use.
Alcoholics can be unpredictable and can be dangerous. When they give up alcohol they are typically even more difficult to get along with for months and sometimes years than when they were drinking. Along with organ failure, many also suffer from severe cognitive issues such as Korsakoff syndrome when they get older.
Both substances are bad for people; and in our society the use of both is encouraged by our media and society. But making marijuana more accessible causes many more problems than it solves. This is an observation made from real world experiences by someone who lives in a place where pot has been legal for years now. And previously it wasn't hard to get, just about any idiot could find a supplier in about 5 minutes. But usage and problems associated have gotten completely out of hand where we live since legalization.
Would making alcohol less accessible cause many fewer problems than it solved?