Munroe redefines it to make it less stupid, but it's still stupid. Which is more likely, that you somehow are missing an entire bridge on fire or collapsing while on it, or that they are being dumb? Mass suicides are not, in fact, unheard of. In the case of 'if Jimmy jumped off a bridge, would you', it's even dumber because Jimmy is jumping off a bridge all the time - to commit suicide. The Golden Gate Bridge alone has had around 1600 suicides (https://en.wikipedia.org/wiki/Suicides_at_the_Golden_Gate_Br...), >20 annually, net of all the safety measures & attempts to talk people down; as far as I am aware, 0 of them were jumping to escape a fire or serious problem, and if they were, at a fatality rate of >98%, it's difficult to think of a real event on the Golden Gate where jumping was better than not jumping. A similar observation obtains for... quite a lot of bridges. (Humans aren't good at falling.)