“They’re not being nice. Why should we be nice to them?" Brown said.
Because that's what makes you the Good Guy. Doing what's right, because it's right, not because they're doing bad. Doing bad because they're doing bad makes you both Bad guys.
See how that works? If I'm an asshole, because everyone else is an asshole, then everyone is an asshole. There are no "Good guys," only assholes. Assholes with guns are dangerous.
Now, this guy tried nonviolent, then less lethal means, before he was (Allegedly) used to use a Gun.
That's what makes him a good guy.