"But our children remind us of the joys in life. It brings us back, shows us what life is all about. This is humanity."
-A woman trying to explain to her alien husband why earth is cool or whatever in the show Invincible. Unbeknownst to her he's actually there to take over the planet anyway if his half-human son ends up getting the same powers he has.
So yes most people have children for selfish reasons but we humans, and in fact all living beings do EVERYTHING for selfish reasons. There is almost no such thing as a true act of altruism because no matter what sacrifices we make, it is all done to satisfy our own egos. Even helping other innocent humans through things like charity or emotional support can be seen as an act of willful evil since benefitting humanity itself also allows more of humanity's evil to spread.
One could make the logical leap to apply this towards all life itself since even helping out plants and animals is still benefitting the scourge of DNA, the very curse that forces every living being into a realm of suffering in the first place.
Anyway, good and evil are such tiresome labels. Once someone gets marked as evil there's seemingly no going back and no chance for redemption. Once someone becomes good then it just becomes all the more shocking when they do slip and disappoint their followers.