Bitterness?

What's it mean to be bitter?

Was MLK bitter? Was Gandhi Bitter? No, I don't liken myself to either of these great men, because I'm not brave enough. (who, in our current society are 'hero-ified' as their negative traits are downplayed in the history books) but I ask, if they saw injustices in front of their eyes, and that motivated them to act.. couldn't they be considered bitter?

Isn't it bitterness to say the way things work do not reflect genuine equality? and then act on it?

But, to change societies thinking by such long strides, you need to be willing to sacrifice a lot. A whole lot.