Also, we have to remember that there were all sorts of negative sensationalistic news coverage in that day, like the suicide of Art Linkletter's daughter, which he blamed on LSD, and then there was Charles Manson, who used LSD in truly evil ways. Then there was Ken Kesey and his Acid Tests, which, if anything, were far more irresponsible than anything Leary ever did, and yet Kesey hardly ever gets the blame for that, and all the blame is heaped upon Leary instead.
Something else to consider is that LSD use was strongly tied to the counter-culture and the anti-War movement, both of which were anathema to many in power in the US. I don't think that all of that association can be laid at Leary's feet. The fact is that young people at the time were interested in these substances and they probably would have flocked to them even had Leary never existed. The time was ripe for it.
One of my favorite quotes from How To Change Your Mind goes like this: "There is so much authority that comes out of the primary mystical experience that it can be threatening to existing hierarchical structures."
LSD was initially studied by psychiatrists as a way to temporarily simulate schizophrenia. Psychiatrists took it themselves to get a better perspective on what their patients were going through. There are stories of this effect not being temporary in some people.
I doubt this time we will see Timothy Learys. I would liken the Timothy Leary era to the 1999 dotcom bubble. It was something new that people didn't know what to do with. Both sides exaggerated. Majority opinion overcorrected. Now we can look at things realistically. We have the advantage of research and decades of people using it. It won't make you enter nirvana. But it also doesn't belong in the same category as drugs that make you break into people's cars.
We almost did see another Timothy Leary. I think Terrence McKenna was almost a Leary, with his advocacy of using mushrooms in "heroic doses". That's really asking for trouble, especially when you know a lot of uninformed users will do so with some of the worst sets and settings.
Psychedelics have a tendency to induce messianic fervor among some people with oversize egos (like Leary, Al Hubbard, and Charles Manson). I think it's very likely there'll be others like them once psychedelics become more popular.
The mainstream media, which bears a large share of responsibility for ushering in the moral panic which led to the Drug War, hasn't gotten any less sensationalistic since those times either. If anything, it's gotten much worse. So the potential for the psychedelic renaissance to get nipped in the bud is in some ways worse now. We're just lucky (or unlucky) that there isn't a massive anti-war movement and countercultural revolution at the moment, but that could change as psychedelic use becomes more widespread.
This is why it's critically important that the rest of us educate people on responsible ways of using psychedelics, and on their risks as well as benefits.
Someone needs to keep their feet on the ground while others are flying away in to the sky.