I'd disagree too about having children but that's just my opinion. If our purpose is to take our code and hand it down to more generations, then taking different forms of code which are handed down, such as information, all that we learn, is essentially the same.
Our verbal codes are handed down, written codes, etc. We take information or energy and exchange them. At the root, that seems to be going on with everything in the universe. Energy being converted. We're all converting energy, or information (form of energy) and exchanging it, handing it to other people or things. The universe seems one big energetic daisy chain. Now what is the end of all this energy, the culmination, or the beginning, we just don't know. All this seems to lead to nowhere we know of and came from nowhere we can be sure of.
If you feel you have to find motivation to keep going, to me, it's nothing wrong with it. And if you don't feel motivated and want to end your life, I don't see anything wrong with it either. Of course, most people fear this view because truth is human-centric. It would be a view deemed disadvantageous for survival. The DNA code, you, couldn't be transferred anymore if you maintain negative views. If you want to think with reason, this tells me that. If I want to think with emotion, I'd say find motivation and try to stick it out. I think reason tells me my emotional side is just as valid and valuable as my logical side.
I think we all try to listen to our logical side here a lot and try to oversaturate ourselves with it to make it harder to listen to our emotional side. I try to downplay my emotional side a lot but I do realize that, although it's a primitive instinct, it came from somewhere valid just as well.
I see all opinions as realist, or deserving of validation that it's purveying a real view. If you view the purpose to have children, that's all fine and valid to me, I just disagree in that it's too specific to be universally true.