Interesting that two of the three old movies that @Crane cites were by John Huston. I’ve read that most, though not all, his movies, though as diverse as The Red Badge of Courage, Freud or Night of the Iguana, had at their center a character who was willing to risk everything for the sake of self-realization. (Contrast that with Martin Scorsese, whose stories are more “how the Hell did I get myself into this?”)
I’m not sure adventure itself is fallen out of fashion. Baby Boomers could run off and hashish-hitchhike through Afghanistan fifty years ago. Their grandchildren today would be suicidal to do that today, both literally and careerwise. Better to get good grades, get a good job, and then the only risk is taking that chimera PTO to spend $1000s in Thailand where gramps backpacked it for chump change.
And that’s the middle class. For 1970s working class kids, for every red-blooded American boy it was perfectly normal to swing on a fat cop’s jaw at least once in life (I had shipmates who even tried it with Tijuana cops!). As far as I can tell, that sort of attitude is utterly alien today, and hardass shop teachers who see it their mission to break punks are as much bygone as Dickensian crofters.