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Explanation
This comic imagines a time traveler who goes back in time to kill baby Hitler -- one of the most well-known philosophical thought experiments about time travel ethics. However, the traveler runs into a practical problem: the "setting" on their assassination method is too harsh, so they're considering a gentler approach. They end up rationalizing doing nothing because even a small intervention would be enough "to justify failure" -- in other words, they'd rather find a philosophical excuse not to act.
The humor comes from deflating the grand moral weight of the "would you kill baby Hitler?" thought experiment by turning it into a mundane logistical complaint. Instead of wrestling with deep ethical questions about murdering an infant to prevent the Holocaust, the time traveler is fussing over technique like someone adjusting the settings on a household appliance. The punchline reveals they're actually an ethicist or philosopher who, true to stereotype, would rather philosophize about action than actually take it. It satirizes how philosophers can use intellectual complexity as a reason for inaction, even when the moral stakes are supposedly clear.
The comic also plays on the idea that time-travel assassination scenarios, despite being staples of pop philosophy, would be far messier and more awkward in practice than the clean hypothetical suggests.