That's not true, in fact it is actually the very reverse. Many if not most of the so-called 1960 era leftists & radicals came from very wealthy families & backgrounds.
Examples include 0bama's pal such as Bill Ayers ( whose father was CEO of GE and got the bombing charges dropped against his spoiled rotten son, who by the way wrote about killing your parents).
Other examples include Patty Hearst, Che Guevara, Jane Fonda, the SDS Weathermen whose wealthy parents paid for Columbia University educations while their rotten kids engaged in protests & breaking the law.
My estimate is that 90% of 1960's radicals AND 90% of today's radical leftists/muzzzlims/liberals come from wealthy parents who pay for their kids to bomb & maim & kill innocent lives. The best current example of this is 0bama bin Laden, supposedly now dead (BTW I intentionally spelled 0sama as our current usurper 0bama).
Sorry about that... I read “healthy” and instead wrote about “wealthy” parents of leftists & radicals. You are right, very few of these radicals come from well rounded, emotionally “healthy” families