> Why? I get the warm-and-fuzzy angle of "instilling civic responsibility"

I have found that when older people ask young people to do this kind of "mandatory service" they never specify what exactly are they going to do while being on the government's leash.

It's always this warm fuzzy hand wavy "civic responsibility" or "build communities" thing, that they always seem to think is something someone else should do when they are fully capable of doing it themselves.