The type of person who believes the essence of evil is injustice — bias, greed, selfishness, callousness, and so on — tends to interpret more radical forms of evil as justified reactions to injustice.

They have a truncated conception of evil. Anything  beyond injustice on the spectrum of moral negativity — sadism, hatred, vengeance, malevolence, the desire to annihilate — is as invisible to them as ultraviolet.

Unfortunately, their conception of good is equally truncated. This type views the essence of good as the fight for justice against injustice. As a result, they are all too inclined to interpret radically evil actions as aggressive — but righteous —  resistance to injustice, deserving their full, enthusiastic support.

Consequently, this type not only tolerates radical evil, but supports it — and at times actively participates in evil.