I can't for the life of me figure out where I got this old ass image from, but I find it intensely funny as a philosophical amoralist. Hell, it's funny from a vegan perspective, or even from a "this reads like satire" perspective.
"It's a trespasser so I killed it", "the rodent was a thief so I gave it the death penalty", "You are a psychopath for questing the arbitrariness of conventional moral standards".
Best part is, according to the metadata of this screenshot, I took this screenshot on some post titled the biggest flaw of my hero academia, which raises more questions than it answers.
Millions of insects, slugs and small rodents are killed every year to protect crops, animal feed and food production no matter one's diet (eating is necessary for survival as far as I'm aware, humans haven't figured out photosynthesis yet), so it just gets even more ridiculous as a moral or ethical conundrum. Both parties here have no idea what they're talking about. Talking about livestock animals would've been a better argument, as one can survive without killing them.
Though I agree with the idea that you should not kill things for fun, of course.