The urbanists are vocal online because of something they're unsatisfied with in their life - if you talk to them and dig into it, they're complaining about a lack, a lack that they think would be filled if they could just afford to live in NY or Europe (because they assume everyone in NY lives like Friends or something).

If instead of trying to solve loneliness through urban development they dedicated their efforts to "touching grass/concrete" and got to know their community - suddenly they'd discover they have the power to urbanize - but do they still have the desire?