Because that cannot continue in perpetuity. The cracks are already starting to show. If I were in my 60s faced with the real possibility of living another 15-30 years I'd want the younger people to feel like they had something to look forward to. Many young and middle-aged people in the US don't feel that way. What they can't get through the ballot box, they'll get other ways, ways that will cause others to say "I'm not saying I agree, I'm saying I understand."

It's the job of government to make sure that doesn't happen, not cater to it.