When I was a child, I stayed with my grandmother for a few years in the country. Then, like the silly child I was, as well as my playmates, I killed various small animals, lizards, frogs, and insects. Then I wanted to grow birds and I had nowhere to get them, so I took chicks from nests and tried to look after them myself. The chicks didn't want to feed and died.
It took several years of growing up to understand what terrible deeds I had done.
I haven't killed a fly since. The spiders my wife is afraid of I catch in the house, with care, and take them outside. I have a permanent feeling of guilt because of these childhood mistakes.

It is unimaginable to think of harming a human being but I know that if I were a soldier I could not choose, I could not refuse orders, but I think I'd try to be human. Of course, this is theoretical, nobody knows how they react in real situations, as they are now in wartime.