Take even your 'well known' examples of speed traps 'known to cause an increase in traffic accidents' (do you have a source?) - the people who were speeding and

Take even your 'well known' examples of speed traps 'known to cause an increase in traffic accidents' (do you have a source?) - the people who were speeding and slammed on their brakes must share most, if not all, of the blame if they caused an accident as a result. What's more important, assigning / shifting blame or preventing harm?