Most join the military to get a free degree. Many nerds work for the military cause they're the only ones who have the funds for cutting edge vision or energy projects. They're ordinary humans who want a job, and aren't actively evil.
Discussion
So they haven't heard of the US military before joining? Lmao
They probably did. They don't care about the big picture. The bad stuff happens thousands of miles away.
So look up what "good" and "evil" mean Mr. English Is The Language Of The Internet
It's okay to be evil. You have more fun that way.
No, that's a delusion. Memento Mori.
Join the dark side. Being a goodie two shoes is lame. 😀
You're just overwhelmed by how dark the world is without your help anyway.