Explain xkcd: It's 'cause you're dumb.
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Cueball explains being worried about autonomous cars, noting that it may be possible to fool the sensory systems of the vehicles. This is a common concern with AIs; since they think analytically and have little to no capability for abstract thought, they can be fooled by things a human would immediately realize is deceptive.
However, Cueball quickly realizes that his argument actually doesn't hold up when comparing AI drivers to human drivers, as both in fact rely on the same guidance framework. Human drivers follow signs and road markings, and must obey the laws of the road just as an AI must. Therefore, attacking the road infrastructure impacts both AIs and humans equally in this case.
Cueball further wonders why, in this case, nobody tries to fool human drivers as they might try to fool an AI, but White Hat and Megan point out the obvious sociological answer; that most road safety systems benefit from humans not actively trying to maliciously sabotage them.
The title text continues the line of reasoning, noting that if most people did suddenly become murderers, the AI would need to be upgraded in order to deal with the presumable increase in people trying to cause car crashes by fooling the AI - a somewhat narrowly-focused solution given that a world full of murderers would probably have many more problems than that.
- [Cueball is speaking while standing alone in a slim panel.]
- Cueball: I worry about self-driving car safety features.
- [In a frame-less panel it turns out that Cueball is standing between White Hat and Megan, holding his arms out towards each of them, while he continues to speak.]
- Cueball: What's to stop someone from painting fake lines on the road, or dropping a cutout of a pedestrian onto a highway, to make cars swerve and crash?
- [Zoom in on Cueball's head as he continues to contemplate the situation holding a hand to his chin, while looking in White Hat's direction. Megan replies from off-panel behind him.]
- Cueball: Except... those things would also work on human drivers. What's stopping people now?
- Megan (off-panel): Yeah, causing car crashes isn't hard.
- [Zoom back out to show all three of them again.]
- White Hat: I guess it's just that most people aren't murderers?
- Cueball: Oh, right. I always forget.
- Megan: An underappreciated component of our road safety system.
The title text was published with a typo: "murderers" was misspelled as "muderers."
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