I am afraid this sounds like wishful sentimentalism. Happiness also leads to laziness, inertia, hedonism, etc., while difficulties and challenges arise one to inventiveness, productivity, resourcefulness, etc.. It's simply not clear that happiness would lead to better survival. Also, I don't see why there is a need for dopamines to be intermediary chemicals to drive us. Why not directly have 'perseverance' chemicals. We can be like robots, food is all we need to expand and multiply. Maybe we're not quite there yet, and in a distant future our civilization will be much more utilitarian :|
In any case, in the atheistic world view, wouldn't we have to conclude our current day aesthetic morals are just a hindrance to suit our unevolved biology?
I am sorry, but this is too vague for me. Love for what. My neighbour or my neighbour's wife?
We can just look at and understand who we are...doesn't matter why mother nature and/or divine/greater intelligence made us like this instead of a different way.
We got to this point by having big hearts and big minds - not claws, super speed, great sense of smell and hearing, or ability to swoop down on prey.
Our biggest urges are happiness and survival. Common sense and little bit of observation tells you whether laziness and greed are good ways to fulfill them. Teamwork and strength in numbers is logically beneficial but you also can get perversion that leads to tyrants and slavery or what not.
Fundamentally morality is being human, human-being is morality. It gets life done and makes it meaningful and enjoyable. Just about all traditions of religion and philosophy point to this because it's not really that difficult to comprehend. Theist or atheist alike they talk about the Good, Love, Compassionate-Wisdom, Harmony, Virtue, Peace as the highest ideals and foundation that everything else builds from.
I am a theist my self but don't discuss it much because our theology and beliefs about metaphysics, supernatural, etc. are not the most important issues. Any divine mind that would have creates us would want us to focus on doing life right first and foremost and not how well we comprehend scriptures or perceive the mystical. Everybody now likes to imagine their deity created life as some type of quiz-show and your answers are more important than what you really do with your life.
Even little kids understand the basis of morality before they get confused and bewildered with all the other nonsense. People over-thinking it.
Why does a persons dog love them?