No one killed the Jews either....those in charge had instead determined that the Jews weren't fully humans.

Or the black slaves...they were only 3/5ths of a person.

When one is faced with a moral dilemma, just let one's intellect be co-opted. Get it to "re-classify" the thorny problem away.  The intellect's job is to classify and name things.  Easy peasy. 

That's what is so good about emotions...just let them get into the driver's seat, and they can make a lot of problems go away, or at least seemingly so.  The sadness returns, and the self-defensiveness and prickliness just grow!