I am a former professional cyclist. I rode about 25k miles a year for a fair amount of years. Running through stop signs was common and everyone did it but you also knew that you had to look very carefully and if it was a 2 way stop and not a 4 way, there are ZERO expectations that the crossing traffic would stop for you.
Also, even with a four way stop, it was and is common practice to slow down and make eye contact with the crossing drivers and waver or be waved before you roll through.
I feel horrible for Nicky and his family but based on what I am reading, I don't think that the fault can live 100% with the driver, even if he was going 42mph in a 30 mph.