So you're saying those "outraged" parents don't like it either and don't like to see people freeloading and not taking their share of the pain? They're "outraged" because some people are getting off scott-free?
We're not some small tribe in danger of going extinct. It's a terrible argument to say someone who doesn't reproduce is a freeloader. We need less people on this planet, not more. We're on pace to have 10 billion by mid century. That's going to be a challenge to support that many people while not ruining the environment in the process.
To be honest, that's a very freeloader-like mindset: "I don't have to contribute to X because someone else will take care of it for me."