I never felt like my cohorts in the 90s generation didn't care. I was involved in all sorts of activism in college, and we just failed to affect any change. The baby boom generation was at its prime, and we were a such a tiny youth contingent, we got knocked down at every turn. At some point, you learn to expect failure. So yeah, it was kind of a bleak/angry era, but it came from impotence and frustration rather than indifference.
And yet, there was joy there too. Fiddling while Rome burns, as rachylou said.
True story: I worked hard all through college to change the Native American mascot at my school. A lot of us did. All our efforts came to zilch until 2007, when the millennials finally got it done. Figures.