The world's angry because hardly anyone gets what they want out of life.
Probably 95/100 people hate their jobs, and probably 4 of those 5 are unhappy with the pay.
Probably 3/4 people married someone they barely even like just because it was convenient, and now feel it's too late to start over.
People are pissed off at the government, sick of metro city stop-n-go traffic, sick of their kids being fuck ups/not liking the same hobbies they like.
Then there's the people who think everyone owes them something. Like people with no education who think it's the government's fault or employer discrimination as the reason they can't find a decent job, or women who get knocked up, then expect the government to pay her to stay home for like five years.
Fuck, how many people do you think live completely fulfilling lives? Maybe 1% at best?
It's just human nature to be wanty. When people don't get what they want, they get angry. Some do something about it (winners), but most just get angry and blame society (losers).
In this world, there's probably 19 losers for every one winner.