This is an interesting thread and I have to say I am pulled from all angles. (I agree with everyone, in other words.) Recently, I had a hawk terrorizing my bantys. It would not bother my bigger girls but the bantys were fair game. (Or un-fair depends who you ask!) It was either get my b-b gun out or sit and watch the bantys in case my repeat offender decides to make an appearance.
I was told NOT shoot the hawk just hit the post, branch or leaf it is near to scare it off. The hawk would get the hint...eventually. However, it would be the ONE time I decided to just scare the hawk, I would HIT it. Mind you, any other time...I suck at shooting the b-b gun. For some reason this did not set well with me and it put my stomach in knots.
However...my bantys are used to being out in the free world...SO!
I sit with them...out there! I will take a BIG book, crossword and/or pen & paper (to write letters or journal) while I sit out there with the bantys. Is that crazy, or what? My neighbors drive by and think I'm a nut case when they drive by!
The first few times I was out there, the hawk did make a couple of visits and both times, as soon as I got up, it flew right off...whether it was me or not, I will never know but, it hasn't come back. Still, I sit out there with the bantys. That hawk's got a mean Mexican to deal with yo!

un
If we had a raccoon problem it would be a different story. All my birds are securely locked up at night so nothing can get in there. (Again, knock on wood!) Good thing they are nocturnal predators.
I think I would have a problem killing a raccoon or any other predator...but when it came down to the safety of my chickens-they come first. I would have to do it though a part of me is behind...running after me - yelling...
"NOOOOOO!!!"
~c:->
PS Glad the worse I've ever had to deal with is a hawk. A little swallow tail hawk too! Cute little bugger!