"It doesn't cost anything to be kind." Being a sociopath doesn't cost anything either.
The Cost of Being Kind
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke is that being kind is free, but so is being a sociopath. Basically, it's pointing out that being a bad person has no financial consequences, which is kinda messed up, right? Just like your comprehension skills, BTW.