I find Moglen's absolutist point of view on this issue refreshing.
You're not obligated to give up your car or go vegan to write about certain issues, but you're a hypocrite if you don't acknowledge your own contribution to a problem.
Two examples:
Al Gore did a great job spreading the word about global warming, but he still has a larger carbon footprint than most Americans (it's well-documented).
Jonathan Safran Foer became vegan when he researched and wrote his book "Eating Animals" about animal cruelty.
We need more people like Foer, do we not?