How to use "justify" in a sentence

If by the mere force of numbers a majority should deprive a minority of any clearly written Constitutional right, it might, in a moral point of view, justify revolution - certainly would if such a right were a vital one

What possible excuse could he have? What twisted logic could justify this sort of sick behavior? It was crazy, hateful.

I even tried to justify some of his actions, because I didn't want Danny to hate him