Ever heard of 'peacekeeping'? I'll give you a hint, it has nothing to do with killing people
Aw, that's quaint. Peacekeeping has nothing to do with killing people.
So I suppose the Australian Army never had to kill anyone whilst they were peacekeeping in East Timor?
The UN never had to kill anyone whilst they were peacekeeping (very badly) in Bosnia?
Here's a tip for you, armed forces personnel are generally;
1. Very young
2. Trained to kill people
3. Given the resources in order to kill people as efficiently as possible
4. Sent off into the world to kill people
... and so it should come as no surprise to anyone that they sometimes manage to... kill people.
You see that's what the armed forces are for. If they weren't meant to kill people they'd be the diplomatic corps.