Parents compensate for child deaths by having more children. When those children don't die you end up with overpopulation. If parents know their children won't die they won't have more than three.

I think you will have to work pretty hard to pull many supporters to the 'pro-human-death' team.

Most people, I think, are in favor of protecting the ecosystem implicitly because it makes the world a more pleasant place for us to live in. There's talk about not harming the planet for philosophical reasons but that's all window dressing. Humans work for humans.

By this reasoning we should remove all safety laws.

What reasoning? If safety laws were intended to reduce environmental damage, then, yes. But they clearly aren't.