Liberals believe if they ban guns that the very people they think are murdering nutcases with guns will be compliant and civil and comply with the gun ban.
You have basically said the same thing about conservatives: They can be trusted but not in the presence of pot, then they’ll just turn into weak-minded, screwed up potheads.
Drugs affect brain chemistry which affect thinking and so on. A gun usually isn’t ingested. Well I suppose if you also aim one at your head you’ll get a good chemical redo as well.