The obvious response to the title of this node is that, yes, you indeed can fight evil with a macaroni duck
1. Locate an evil that needs fighting, preferably one that can be easily crushed.
2. Fashion a macaroni duck from macaroni and rubber cement. Be sure that your macaroni duck weighs in excess of 250kg.
3. Drop said duck on aforementioned evil from great heights.
Congratulations. You have now fought evil with a macaroni duck. Next time, get a Ruger 9mm, which my neighbor down the hall tells me is good for killing dwarves, or for that matter just about anything else, and which can easily be stored in an oversized boot.