skeptic, when you say there is no "problem of evil" are you saying that there is no such thing as evil? Or are you saying that there is evil, but it has nothing to do with god, therefore it is not a problem?
I don't think the world is "perfectly fine". Nor do I think the world is "fallen and full of sin". The world is what it is, with both good and bad things, neither a paradise or a hell for most people.
I don't have any problem wrapping my mind around the world having good as well as bad things. Science has helped us to understand the world and made many of the bad things better. So, the "problem of evil" is not really a problem for atheists: the world is what it is, remember?
It is the people who say the whole universe was made special for us humans by a perfect loving god
who have to account for all the bad things, the stuff that hurts and kills us, the fact that the universe is actually hostile to human life. That is what is confusing and leads to people doubting religion, all the apologetics and bad parent analogies
Side point-- you still seem to be confusing atheists (people who don't think that there is a god) with nihilists (people who don't think life has any meaning). It would be a good question to ask a nihilist why have kids or do anything at all. But that question makes no sense to an atheist. I am not a nihilist. I am an atheist and I think that life has tons of meaning. Just not any meaning that comes from a supernatural being. Life has meaning because we give it meaning
Giving a good lecture to a class, watching my kid grow up, talking with my husband, laughing with my sister, having a nice dinner, watching the new Sherlock series, enjoying my doggies, helping people who need it, learning more about science, esp evolution, playing with my friends' babies, knitting, trying to lose weight, looking forward to spring, trying to make the world a better place by doing lefty political stuff, attempting without much success to ignore the Superbowl (cute quarterback of color Russell Manning!!!!), looking at animals on cuteoverload, writing fan fiction stories-- and blogging on this site-- all that and more gives meaning to my life.