I believe keeping silent is also an action if it prevents further destruction. Being quite may mean different things - one is you are patient and doesn't want to aggravate the problem by doing anything hastily, second is you are too foolish or ignorant and arrogant enough to not to understand the seriousness of the problem, the next is you are too afraid to take action and surrendered yourself to the problem and the other means your are unaffected or indifferent i.e, you don't want to take the problem on to your head and want others to suffer it. The meaning of silence changes with the situation and most importantly the person who is facing the problem. If silence means patience the person is an emotionally balanced person, if it means underestimation of problem you are stubborn or foolish or overconfident, if it means silent suffering you are a coward or afraid of society or too sensitive that you don't want to hurt anyone with your acts, if your silence means indifference then you are a selfish - escapist.
Srinivas sir I must admit that I am still a learner in such issues and if said anything wrong please let me know and forgive me. I said all this out of my knowledge as a literature student.