Hot is a slight understatement lol. It was 30°+ in the shadows everyday, I think there were 3 occassions through the 8 days when the sun was blocked by clouds (for 3 hours max) and I spent the entire trip covered in sunburns. I probably drank 8+ litres of water a day.
Even if your moral system solves those "problems", you just "solved" them by substituting the obvious and logical base of utility through personal responsibility. Personal responsibility is no inherent good, unlike utility, if people are unhappy/"feel bad", it doesn't matter how personally responsible everyone is being, that world is still a shit place.
Also, the threat isn't imagined. I can assure you that there are a lot more than one person on earth who would choose to kill as many people as possible if given the option.
Idk which moral system you operate under, but I'm concerned with minimising human suffering. That implies hitting kill because chances of a mass murderer are too high not to. You also don't follow traffic laws to a t, but exercise caution because you don't really care whose fault it ends up being, you want to avoid bad outcomes (in this case the extinction of humankind).
I just calculated the sum from n=0 to 32 (because 2^33>current global population). And that calculation implies that the chance of catching someone willing to kill all of humanity would have to be lower than 1/8 billion for the expected value of doubling it to be larger than just killing one person.
It does create the funny paradox where, up to a certain point, a rational utilitarian would choose to kill and a rational mass murderer trying to maximise deaths would choose to double it.
You would need a crazy low probability of a lunatic or a mass murderer being down the line to justify not to kill one person
Edit: Sum(2n (1-p)(n-1) p) ~ Sum(2n p) for p small. So you'd need a p= (2×232 -2) ~ 1/(8 billion) chance of catching a psycho for expected values to be equal. I.e. there is only a single person tops who would decide to kill all on earth.
The real question is whether they'll federate with NSFW subs.