He rode a blazing saddle
He wore a shiny star
His job to offer battle
To bad men near and far
There was a time when people generally recognized that there was good and bad in the world. People were raised with enough of a grounding that most agreed on the basic behaviors that constituted good or bad. And it wasn't enough to try to understand or sympathize. Bad had to be fought. Wherever bad men did bad things the only hope has always been a good man or good woman who will stand up and stop them. Offer battle. The bad guy may back down, but force or the credible threat of force is the only thing that has ever stopped someone bent on violence.
I have my personal definition of bad and evil. A bad guy will hurt someone to get what he wants. Evil will hurt someone even if there is nothing to gain. It's simple, but it works for me... until you get into the whiny bullshit that hurt feelings are the same as being injured or that someone not giving you stuff is the same as someone taking your stuff away.
But there I go, being old school again.