Even for people who live blessed lives in wealth and comfort in a developed, rich nation, life is always going to be composed of more pain than pleasure. That's just the human condition: to always want but rarely have. Even if you aren't plagued by disease or disability; even if you have all your "needs" met; even if you have friends and a lover and a sturdy roof over your head; even if you never have to deal with living in a warzone or being persecuted for being a minority; even in this case, you still spend more time unhappy than happy. You are uncomfortable more often than comfortable; hungry more often than full; sad or angry or depressed or bored more often than happy or even content; and if you by some miracle manage to accomplish everything you ever wanted, even if you become a billionaire playboy, you STILL will not be content. You CAN'T be content. You will always want more, and if you're rich enough, all that happens is you find out (to your misfortune) that there is no more. Why do you think so many celebrities die of taking bizarre cocktails of drugs? Because there is nothing left for them to gain in life but they are still not happy. They can't be happy but for a few moments at a time. Even when asleep there is still nightmares.
Having a child is the ultimate act of selfishness that a person can commit. It's being the direct cause of a life to be created, a life that is guaranteed to be mostly pain… and for what? For vanity? For security? For your country? For the complete fucking joke that is a "genetic legacy"? Having a child is no different from holding someone against their will and mentally and physically torturing them for ~70 years. A crime of unimaginable cruelty and insanity. Yet we think of this action as "normal", because we have grown to assume that life SHOULD exist, despite it being objectively horrible.
I commute to work through a semi-rural area bordered by farms and mountains. Almost every day at night when I return home, I see rabbits run across the road. Rabbits are pretty stupid, so they have a tendency to run TOWARD danger rather than away from it — meaning instead of darting into the bushes away from the incoming car, they run across the street right in front of it. I can never see them until they jump into the headlights, by which point it's too late to even take my foot off the gas, much less try the brake. Swerving would only put myself in danger, so of course I don't. Most of the time by virtue of mathematics (large road, small tires) the rabbit survives. But sometimes it does not. Sometimes I feel a slight bump as the rabbit gets run over and dies instantly.
And I have to think: what an incredible kindness I have just perpetrated. Think of the life of a wild rabbit. A few years of constant hunger and fear, days eating nonstop just to gain enough nutrition to survive, nights running away from owls and coyotes (and sometimes cars) in a desperate attempt to avoid a terrible death (and a car is MUCH faster than getting eaten alive, of course), and why? For the small chance that they might survive long enough to grab another member of their species, fuck, and make some more rabbits who will also live the exact same life of pain and suffering. Compare this to the coyote who also lives a struggle, also running from cars, and dogs, and hunters with guns; they don't spend all their time in fear of being eaten, but compared to the rabbit (who is surrounded by plants to eat) they have to struggle to find food to eat; they spend most of their time constantly battling starvation; and like the rabbit they also live only a few years, and if they are "lucky" manage to successfully fuck and make some coyote pups to perpetrate the cycle. And for what? Is the pleasure gained by the coyote that eats the rabbit in any way equal to the pain suffered by the rabbit being eaten alive? Of course not. Imagine the best meal you've ever eaten, and then imagine what happened to the characters in Jurassic Park as they were eviscerated by raptors. No, it's not even close. Life is composed of VASTLY more pain than pleasure.