good
Explanation
The Joke
A woman states her belief that "human beings are all essentially kind and peaceful." A man responds with what seems like a reasonable follow-up question: if she truly believes everyone is inherently good, she must be angry all the time watching people actively defy their essential nature. It is a fair logical deduction -- if goodness is the default, then every act of cruelty represents a deliberate betrayal of human potential, which would be infuriating.
The final panel delivers the punchline with the woman, now shown against a menacing red background with a terrifying expression, declaring, "I want to cut them into meat." The joke is that her belief in humanity's inherent goodness does not make her a gentle optimist -- it makes her a furious idealist who views every bad actor as a traitor to the species deserving of extreme punishment.
The Humor
The humor comes from the violent whiplash between the woman's serene philosophical position and her psychopathic conclusion. The comic satirizes a real psychological phenomenon: people who hold strong idealistic beliefs about human nature can become the most intolerant and rageful when confronted with evidence that contradicts those beliefs. The man's horrified reaction in the final panel mirrors the reader's own shock. Weinersmith is playing with the idea that extreme optimism about human nature and extreme misanthropy are not opposites but can be two sides of the same coin -- the stronger your faith in what people should be, the more violently you react to what they actually are.