The more you think you have convinced yourself not to have kids, the wider the door opens. Every human before you has had to deal with evil and heartache as well as joy and the mountain top.
But if you don't want to have kids the please don't. Adoption is good but don't do that either. When you want to place yourself to the side and take on the responsibility, then adopt. Otherwise just stick to dating or marriage and do something good with that.
Are we not over thinking value here to some degree?
We have people who treat their pets better than some humans. We have some humans who treat animals pretty bad and don't blink.
There may not be a one size fits all psychological glove in this case.