I do think there's less emphasis on self-control and more emphasis on having things all your own way than there used to be. I could be wrong, though, as my opinion comes from pop culture and not from any sort of controlled study.
Mine comes from a lot of studies. I won't bore you with the sociology babble, but the upshot is that 'boomers' are the most batshit selfish entitled cohort of people who have existed in modern times. They have, for most of their existence, been the largest group and thus catered to on almost every level. Music they liked became 'classic', their writers became great writers, they were born at the height of American power and cultural hegemony, and even their 'rebellion' was close to a risk free peer reinforced growth stage they paid no penalty for.
They have, as they aged, become more conservative. People do that, it's not unique to them, but they've also seen their collective influence over society dwindle. They no longer get everything they want all of the time. Thus the anger. An entire generation of spoiled children abruptly realizing they might not get what they want in the end is the genesis of this anger. It's what the Tea Party is all about. Why wouldn't they believe if they just band together and say what they want it'll happen? It always has. When it doesn't there is some serious cognitive dissonance happening that further bonds them to idiotic positions they might not even believe without that context of not getting what they want.
There's also the legitimate anger of the generations that come after them. Although people our (my? I forget how old you are) age are more cynical than angry. We missed the height of the easy American Dream: "I graduated from high school, went to work at the plant, joined the union and made enough to buy 4 bedroom house and new cars every 3 years. Why are you kids so lazy?" but, we were around for one of the greatest boom employment markets in history. If you could type and use a mouse in 1995, you probably did pretty well by now. People in their 20s have cause to be actually angry.
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