Why do we take people seriously who use marijuana?

Many studies have shown that marijuana causes distorted perceptions, problems with memory and learning, trouble thinking and problem solving, hallucinations, delusions, impaired memory, and disorientation. This explains why so many potheads are crazy liberals who hate their own country and come up with some many crack-POT conspiracy theories about 9-11. And yet, they are in government (half the DNC and a few republicans) and are taken seriously every day.