It's so fucked up. Imagine you went to vaccinate your kid and the doctor lied to you, injected them with saline. Then you go out believing your kid is immunized.
Those people should definitely sue the fucker and his employer in civil court for child endangerment. If you can't get justice then at least take everything he has. Also that way Trump and his cronies can't let him get away with it again.
Providing people with high standard of living lowers birth rates. It's a well established effect, every single country with high standard of living has low birthrates. Providing people with sexual education and sexual health also lowers birth rates. Educated people that have easy access to birth control will have fewer children.
Provide people with education and things they need and overpopulation is an issue that fixes itself.