I don’t think punishing bad guys makes you a good guy.

you’re missing the point. There are a slew of contradictions in christian dogma that don’t make any sense at all. People who “punish” people are typically the good guys in stories. Take a sheriff in a western for instance. They chase the robber and throw them in jail as a form of punishment. The meme is just showcasing an example of how religion faulters under critical examination