I've wondered about this since I was a young kid, and I still haven't figured it out. You are completely right and we should be outraged, and not shrugging it off as "accidents happen". The only explanations I've come to are the cynical ones: as a society we value convenience more highly than other people's well-being, and we don't understand that risk, as potential harm to an individual, is identical to actual harm when applied broadly.

How many times have you heard risky behavior justified - I mean risky to other people, not just the person taking the risk - justified because nothing bad happened? Or even that it was the right decision "because it worked". I honestly think it's a cultural blind spot that people can't understand what's wrong with that reasoning.