To be fair, one needs to consider both absolute and relative speeds. Risk increases monotonically with absolute speed, but if you are going around the average speed of other vehicles on the road, that is safer than going slower. Many drivers I've spoken with will point that out as if it says speeding is safer. But the reality is that slower speeds for everyone and relatively little spread are what's actually safer.
Learning patience and driving slower is a more productive use of one's time than fighting a speeding ticket. I am confident there's something about cars that actively erodes away patience in a way you don't see in bikes for example.
This advice is good on highways to avoid colliding with other vehicles at high speeds. On local streets, it's better to be the neighborhood pace car and slow down :-)
https://one.nhtsa.gov/people/injury/research/pub/HS809012.ht...
Table 2 in that link shows fatalities approximately doubling for each 5 mph increment of speed added.
That doesn't even take into account the increased likelihood of hitting someone (increased speed means decreased ability to react and stop).
And yes, most (U.S.) roads are designed in such a way that practically begs motorists to speed. And thus speeding is the norm. Man if I had a dollar for every HN thread where someone bragged about getting out of a speeding ticket...