most societies believe that each individual must contribute to some degree. It's being lost, but for most societies historically the mentally ill were the burden of the immediate family.

Now we see the effects of the mental illness affecting society-at-large, it stands to reason that the entirety of the affected population is now somewhat responsible for making their own lives better by trying to assess and remediate the problems within their society.

If I walked past litter on the ground in my home-town, I wouldn't say "Hey, not my job." and walk past it, I would pick it up for the betterment of my town.

This isn't a foreign concept for most people.