To be able to create intelligent life. Not just having a regular baby, but actually creating something through science or magic. How awesome that would be. Well. Awesome, assuming that it actually works. And that it works in a benevolent way. In some works, it actually does. If other created individuals are evil by nature, then both tropes apply. If all the created individuals are good (and remain reasonably good, instead of falling into the Frankenstein tradition) but all humans hate them, then it's Torches and Pitchforks or Cloning Blues rather then Creating Life Is Bad.