FAFO validity

My friend posted some propaganda

"You cannot murder almost 16,000 children, injure tens of thousands of children, orphan 19,000 children and claim it is self-defence"

I'd love to speak to my friend and have a rational conversation about it, but she's not the type.

So second prize, I wanted to get some DGG commentary.

Hamas's started a war against a country with a disproportionate retaliation deterrence policy.

Why do people struggle so much with the validity of the FAFO concept? Or why does it seem so valid to me?

If I punch a boxer in the face, and they put me in a coma, what the fuck did I expect? There's no reading of the situation that doesn't place the blame on me for punching the boxer.