For an explanation why not, read reports... sure there are a few positive ones, but like 99% of them are negative, and often EXTREMELY negative, with results such as ending up in the hospital hurt or mutilated, or in jail, and often involving being naked and doing such antics as breaking into someone's house because you thought it was yours or something. I've only read like 3 reports ever that sounded like any amount of fun... usually people barely remember, or if they do remember, the events that happen seem like they're completely normal, not at all recreational. It can last for days too. Plus it's extremely unhealthy for your body and mind. And some people report never feeling quite the same again. And it's really easy to dangerously overdose. Plus it in universally described as being physically very uncomfortable.
Datura is exceptionally dangerous and never something to do for fun or because you're bored.
I think sometimes people have a tendency to read reports, find a couple of ones that sound good, and then disregard the massive number of negative ones and warnings. You need to be honest with yourself. If, out of 20 reports, only 1 sounds like anything you'd want to experience, then it's not something you're likely to enjoy.