It seems like not so much a conspiracy theory as something totally transparent and out in the open. There's a huge political push to birth as many babies as possible. Major political parties have it as part of their platform. Their spokespeople talk derisively of "childless cat ladies" and how you're not a real contributor to society unless you produce babies.

The "Birth" lobby is a stool composed of several legs:

1. Attack abortion

2. Attack contraception

3. Attack porn

4. Attack education

5. Attack "women in the workforce"

All of these things are seen as contributing to declining birth rates, so they're opposed by Big Birth. You can see the same politicians tend to go after these things in lock step.