I'm going to explain how SJW's think. In order to do that, i'm going to have to say some disgusting things. Please, I want you to understand, these are not my views, and it hurts me. But here we go.
To a SJW, Frank Castle epitomizes the patriarchal power fantasy of the right. A White male wronged by the criminal activity of society, criminal activity he very likely caused due to the deleterious effect of the American economical caste system on society. He is a reactionary emblem of middle aged white men frightened by losing control of the civilization they have dominated through economics and coercion for centuries. In response to this threat, he resorts to blatant and heartless violence against the poor and mentally ill as part of a self righteous quest to cleanse undesirables from the world. He narcissistically metes out execution without trial, making himself judge jury and executioner. And while the greater universe supposedly demonizes him for his actions, they also secretly lionize him for the expedience with which he carries them out. The White Male author is sympathetic to Frank Castle and his war of violence and discrimination, and elegize him like Christian Monks did the pagan barbarians of cultural epics of the past (ex. Beowulf). All because he was robbed of his "property", his "family" we never meet which only exists to form some sort of nebulous sense of being wronged, but is really only a pretext to exact his sexual and social frustrations on the less fortunate.
Ok. I'm done. Time to go rinse off.