I think what many people are failing to understand is that different people have different reactions to the influence of various drugs. Some can maintain functionality, even excel, while others fall apart.
Those that can operate under the influence presume everyone else can as well, and so they come to places like here and go "Rah Rah Rah!" In favor of letting everyone get exposed to substances that don't cause *THEM* any troubles.
The idea that some people wreck their lives with this stuff just doesn't enter their minds.
“my Sister became Paranoid Schizophrenic because of Pot”
No, she didn’t, but it probably masked the symptoms for 15 years or so.