HapMax seemed like a good idea at first, but this example shows that it is very wrong.

I'm familiar with the Nozick utility monster. Convince me that the monster is wrong, instead of saying "it's obvious". Is there no utility level the monster could have that would justify giving it all resources? That seems very odd to me.

If there are 2 people in a space capsule that will take 1 day to reach Earth, and only enough oxygen for one person to live one day, would you have them both die? If not, how is that different?