Comment by pvg

It's partly a matter of venue - union members reduce their demands to easily chantable slogans on the picket line. That's not what they do when negotiating with management.

I assume you are talking about MLK's Letter from Birmingham Jail. He wasn't criticizing the moderation of their language but the moderation of their ideas. He was famously a practitioner of a kind of radical moderation himself - the notion that a pervasive system of oppression supported by state-sponsored violence can be successfully resisted and overcome by nonviolent means. If one can accept that (despite the fact it clearly 'favors the party doing harm'), expressing one's views on a random nerd messageboard without bombast and fulmination hardly seems like an unreasonable burden.