Amazing title huh? This is actually part of the example sentence for 米兵 (US Soldier).
Wow, what beautiful weather! I feel like I could kill hundreds of American soldiers today.
I don’t really care about political correctness and I’m not even American, you could substitute “American” for any other country in the world and it would feel equally as offensive to me. I know that the people behind WK aren’t always writing these example sentences themselves, so this might be a quote from a book or something, but I still don’t see how a sentence like this belongs on a website for learning Japanese. It just seems really tasteless and out of place to me.