Everybody who uses pot is not a stereotypical "pot head" as you call them. That's naive.
Many people function just fine their whole lives while using pot as their recreation drug of choice. Same with alcohol drinkers.
But painting everyone with a brand brush of generalizations like you do, is not accurate.
Personally, I would rather be around someone who is stoned than someone who is drunk. The difference is dramatic.
What’s naive is try to “teach” people who went to school with and sometimes workrd around or did business with pot heads that we didn’t see what we saw, didn’t hear what we heard, didn’t notice the overall productivity, accuracy of their work and trajectory of the lives of pot heads was ...ahem.... not impressive. We KNOW.