I just want to re-point out that in a mere 4 messages we started from "speeding should only be penalized if it actually harms someone" and got to "why can't you order a 6 year-old to stand in front of a train and jump out of the way".
[1]: This word is not extraneous. There is a form of extreme-based argument that is not useless, but one must be able to tie the argument to a reasonable claim that the extreme may actually occur. This is not one of those cases. There is no chance of people ordering children to stand in front of trains.