Analogy: Suppose the OP was making some criticisms of Israel, and began with a quote from Hitler and said “I never understood why he hated Jews so much, until [example of thing OP is complaining about], now I do.”
At the risk of steelmanning in an ITT-failing way: substitute “justifies” with “makes it seem like a pretty reasonable way to feel about humans and have first-order-reasonable motives to do that sort of stuff to humans”.
I see no suggestion of such justification anywhere in the post.
Analogy: Suppose the OP was making some criticisms of Israel, and began with a quote from Hitler and said “I never understood why he hated Jews so much, until [example of thing OP is complaining about], now I do.”
I believe the canonical form of the meme is “And then one day, for no reason at all, …”
At the risk of steelmanning in an ITT-failing way: substitute “justifies” with “makes it seem like a pretty reasonable way to feel about humans and have first-order-reasonable motives to do that sort of stuff to humans”.