Good point! Though you could argue that preventing that magnitude of future suffering would be worth the price of Ryan & company not existing...

Also, if everything else would have been wholly different too, then in that other universe people would exist who didn't exist in the original universe; why do the original universe people (Group A) get priority over the altered universe people (Group B)?

If you have to choose either:
1.(Group A) existing in a horrific situation and (Group B) not existing at all
or:
2.(Group B) existing in a non-horrific situation and (Group A) not existing at all...

...well, I think I'd say option #2 is better?


(And yes, I have been reading about the nonidentity problem and intergenerational justice...)