>>humans are the one of the kinder and most civilized species
I had to laugh at that, no offense.
>>If our species dies, then it's going to result in more problems than if we continued even by imperfect means.
Seems like it would be many fewer to me.
About your paragraph on civilization, there's so much that's wrong with this. Basically you're equating power through weaponry with "civilization," among other problems.
Property rights exist because they're required under capitalism, which has taken over the planet.
In this scenario, the species would probably collapse anyway because of the level of inbreeding required.
In this screwed-up scenario, I don't know why you would jump to rape when the girl could just be impregnated with semen - probably with her consent.
I don't see why humanity is worth saving, anyway. To me this feeling is just a product of human selfishness and egotism.