When I was graduating high school, my friends basically split in two ways. Half stayed at home or went to college, half enlisted.
There's lots of poverty and meth where I grew up. I had a friend whose mom was a meth addict and he basically grew up by himself. Literally owned 1 pair of jeans. Another lived with only his alcoholic construction worker dad who was never around. A set of twins had a mom who was dating an abusive alcoholic and left them both to go to Missouri two days after they turned 18.
Most of this group enlisted. If they weren't coming from poverty, then their families were lower middle class and they felt too dumb for college. Around that time, any idea of a career felt too hard for them.
Same happened with people a few years my senior. They enlisted. It's the only decent job they could find.
Most served in combat. Some came back fine, some came back missing body parts or with lasting mental health issues.
None of them joined out of maliciousness, or a feeling they wanted to hurt people. They joined because they felt it was the only chance to earn a living.
It would be irresponsible to blame them for that choice.