I understand and respect your views.
When in the army, there were people there who specifically said they joined, because they wanted to kill.
When I was called up to go to Iraq, I was in my late twenties and a couple of TA lads (part time) and said they were going to kill some terrorists. I chided them and one came back without his left foot.
We had a civilian worker, who we all had to go under a cement bunker. We were being mortared. There were another 2 squaddies who tried to kick him out 'for the leg room'. I stated he wasn't going anywhere.
For me to kill someone, it would have to be someone in my house in the middle of the night. I know I would be capable if I had the chance to do it.
And don't misinterpret what I'm saying. There may be times where killing is the only or best option, but that doesn't make it moral, imo.
Anyway, getting back to forgiveness. It's often stated that forgiveness isn't for the other person. It's for the person doing the forgiving. It's someone letting go of the negative thoughts that corrupt their psyche.
Some days I feel I'm almost there, but something (or even nothing) sets me back.