Sober people may jump off a bridge too. Should we outlaw sobriety? The "man on LSD thinks he can fly and jumps out of window" myth is largely that: a myth. If I recall, it was inspired by a real story of LSD experimentation on some kind of federal agent, who was given a good dose of LSD without his knowledge, thought he was going mad, and threw himself out of a window to make it end.
http://www.cbc.ca/canada/british-columbia/story/2010/10/24/b...
Long story short, a student took LSD on a class trip, which involved a visit to the Capilano Suspension Bridge. The student didn't jump off the bridge, but climbed a railing on an observation deck and fell.
More than once I have been convinced (even though I knew I had put a little piece of paper on my tongue) that what was happening to me was outside of the context of 'tripping.'
One time I would have committed suicide had I been convinced that it would have worked. I was completely under the impression that it would only be painful and not really do anything but sort of hit a 'reset' button into what was at the time essentially hell.