You don't see everything. You see what you want to see. Ruby was nice to you, she's nice to a lot of people actually. In this case, she was mean.
He's not being a bully. She hurt him and she knows she did.
Yes people were killing each other before and I actually wouldn't stop lessons being taught so long as no one got hurt. The people that did the killing were wrong. It was revenge. This is a lesson.