Are you really trying to reduce people's lives to simple math?
Yes, I am.
Without an objective method of cost/benefit analysis how the hell are we supposed to determine which risks are worth taking in the first place?
At the same time valuing life infinitely leads to equally absurd and evil conclusions.
An infinitely valuable human live would necessitate protection from anything that might shorten it. We barter risk to life and limb for experience all the time, so unless you’d also like to argue that greasy food, road trips, and skydiving are also of infinite value, enough so to be traded for with smidgens of human life, you need to "Shut up and multiply".
For craps sake, you're acting like the astronauts didn't volunteer for this.