What is wrong with people?

What is wrong with humans? Why can we never be happy? I look at my two cats, they seem fairly content in their lives. One is happy almost all the time. The other, well, he's getting older and seems somewhat pissy at times, but, overall, happy. Especially when he gets a tummy rub. But, people, we're a different story. Give us everything we need to survive, and we want more. Give us more, and it's not enough. Hell, provide us what we want, but, then it's not in the way we want it. How is that we've survived so long? Our unhappiness seems to be hard-wired. Maybe that is why so many religions and social mores look so deeply down upon suicide. Because, we all know that life is an horrific ordeal, and if there was nothing stopping us most of us would off ourselves before we could procreate. It's as if we, the dominate species on this planet, were given some Satanic trade off. Domination of an entire planet, technical and building abilities that no other species exhibits. High culture, complex language, art, fashion, philosophy, science. The ability to conquer disease, nature, each other. But, we will never be happy. We will always find faults in society, government, others, ourselves. We will work to rip everyone around us into little shreds to make ourselves feel just a little bit better. And, we will construct laws, mores and ethics forbidding suicide. No easy way out. It will be ingrained into our individual psyches to the point of near instinct. When someone breaks through the artificial boundary and successfully silences themselves, there will be a collective gasp. "How could they do such a thing? Life is so wonderful. Full of hope and joy. Daisies, tulips and butterflies, oh my!" Meanwhile, we continue to plunge the planet ever deeper into permanent warming. The human population continues to grow way beyond the planet's ability to support all of us. People are cruel to each other, and wars rage on. Yet, we all agree that life is beautiful, somehow worth living. And, because we can't quite figure out why life is worth living, we feel empty inside. So, we attempt to fill that emptiness by buying things. Little things, big things. The more expensive the better. The flashier the better. The more we can lord over our neighbors, our friends, our families, the better. It becomes all about being the best, whatever that happens to mean this 15 minutes. It is some sick cosmic joke. Humans will never be happy. What would happen if there were no strife, no reason to ever be disappointed? Would we create disappointment and discontent from nothingness? Or, would all of humanity stop and cease to exist? Will our internal compass always point toward unease, sadness and bitterness, occasionally bobbing 'round toward passing happiness and satisfaction? Is our nature fixed?