A belief system is--by definition--discrimination against contrary beliefs, and therefore, followers of those contrary beliefs. And one definition of "cruelty" (e.g. to women - by denying full and free access to abortions) might be the inverse of someone else's definition of "cruelty" (e.g. to unborn children - by aborting them).
Someone can presume that they hold the absolute claim to the "truth" of which side is cruel, and which side is intolerant, but as human beings we simply do not and cannot know the truth of the matter.
So the problem I have is, when faced with such a dilemma, calling for violence against someone in the name of being "intolerant to intolerance".