Ah the KoSD is back for more - I refer you to the thread title which is entirely relevant when discussing your deviant ways
Against my better judgement I feel compelled to wade in.
Speeding is nearly always antisocial, often dangerous and always illegal. The fact whether I sometimes speed, always speed or have ever sped is completely irrelevant to this statement. I do not need to be "whiter than white" to realise and agree with this statement. The fact that the argument appears to be that one cannot be critical of speeding unless one has never transgressed this law seems flimsy at best.
The argument on speeding always appears to centre around the fact that the speeding driver appears to have a belief that they have an innate ability to risk assess the situation quickly and accurately and can determine their best speed better than an arbitrary limit. This argument fails on various counts.
Firstly, the vast majority of drivers appear to believe they are "good drivers". A great many appear to believe they have the reaction times of Button and the car control of Ari Vatanen, based upon "experience" and a 20 minute test. Unfortunately this is untrue. A great many drivers are shoot. There are a significant number who are spectacularly shoot. Most people are utterly rubbish at risk assessment even if they are amazing drivers. Enforced speed limits at least have some normalising effect on the worst excesses of these characteristics.
Secondly, the limit is normally not there for the speeding driver's benefit, but for the benefit of the pedestrians, cyclists, and other people who use, live on or near the road. Speeding along a road may be "safe" for the driver, but is almost certainly deeply antisocial for those having to live, cross or use the road alongside them.
It amazes me that we put up with our quality of life being degraded, our road space being made off limits to us, and more dangerous than it should be because some numpty wants to ignore speed limits to get to the Tescos 30 seconds before they would if they actually went slower and made everyones lives a bit more congenial and safer. Being a town dweller, I view my right to be able to amble across my road and not have cars career up and down it more highly than letting someone get to B+Q (or at least the next queue on the way to B+Q) fractions of a minute quicker than if they weren't antisocial, ignorant idiots.