Maybe they want revenge for what we did to them last night.
One of their number had died and they wanted revenge.
They want revenge on the people who killed their families.
You did this to me and now I want my revenge!
Do you think I don't want revenge on those who did it?
They may want revenge - which would be only human.
"How can you let somebody attack your kids and not want revenge?"
In the end, it turns out he only wanted revenge.
You have to understand that they didn't want revenge for personal reasons.
Still, he could have wanted more money, or revenge; perhaps both.