[mrgoldenbrown]

If self control were reliable we wouldn't need seatbelts, antilock brakes, bumpers, and other safety mechanisms. We would all just drive safely all the time. But that would be silly. Self control is not as simple and reliable as we want it to be.

Sometimes systematic solutions are better.

[johnisgood]

I agree that humans are fallible, but the analogy is still off despite being catchy, yet flawed. Seatbelts are passive mechanical systems; self-control is a complex, context-dependent cognitive function. Conflating the two oversimplifies how human behavior actually works.