Oops, sorry I have the contrast turned down on my monitor.
Here you go, I made it quickly in paint.net. You mentioned you liked the hats so I stuck it in there. It's probably the wrong size but oh well.
If you're interested, I made an alternative cover art design.
Well if you look at it like that then wouldn't the allieds in the second world war be considered evil?
The game mechanics where great aswell as the art and design, the music and SFX could have been better. It also should have been set in 1917.
Regarding your philisophical question at the end, I think it's fine to kill evil.