Let's take a comparison. At any given moment there are about 5000 flights in the air above the USA. A 1.5% catastrophic failure rate would mean that we have 10 or so fatal crashes an hour, hour after hour, day after day.
In other words 1.5% failure is a rate that no sane person should find close to tolerable. It's murder.
It’s not murder... sheesh! It’s space exploration with inherent risks. Spam in a can... Riding a bomb... That there haven’t been more catastrophic disasters is the wonder. Your comparison isn’t apples to apples. It’s more like comparing apples to a redwood tree, or oranges to a sea urchin.
I bet that most or all of the astronauts would have chosen to fly even with certain knowledge that they had only a 98.5% chance of coming back alive.