[laws] Of course people ignore laws they don't like - laws mean nothing much if it stops you from doing what you want, or if it's a bit too inconvenient, especially if you're not likely to get caught. Littering, speeding, copyright, tax... Perhaps some people see the speed laws as stupid or irrelevent in certain conditions, and they don't see there being much in the way of consequences if they break them (since they are of course excellent drivers, and they'll never crash or be taken out by other people), so it's ok to go as fast as they feel is necessary, whatever the laws say.
Note, I am NOT saying that all laws are sensible, and this is a GUESS at a reason for some people's behaviour, and it is probably a question that needs careful analysis of the data ;-) -- but I don't have time or energy to look at it now.