behavior

We all know people like this ... "they refuse to speak-up or pitch-in when ideas are developed, are unable or unwilling to go to key meetings, and generally don't have the will, time, or inclination to help their colleagues, but then repeatedly shoot-down the decisions that are made, refuse to help implement them, and bad mouth their more hardworking colleagues"

One of the best examples is someone who refuses to vote and then bemoans the outcome of the election and the state of the nation! 

There is an interesting phenomenon in social psychology called pluralistic ignorance or the "Abilene Paradox".  In short it is the reluctance people have to voice a minority opinion in a group, especially if they feel that they're the only ones holding that opinion.