Why should I care that they don't?

Right, this is the big picture nobody acknowledges. I'm not paying the price for your kid because I don't know them. I couldn't care about them even if I wanted, because their existence doesn't even intersect with my life.

Yes, as a parent, you are required to put in more effort into parenting your kid than random hypothetical people. That's obvious, and has been the case forever.

I understand the concept of community, but community is not me sacrificing my privacy for someone 1000 miles away.

If parents don't want to do X, Y, and Z to lock down their devices then that is their right. And I support their rights, so the conversation is over right then and there IMO.

Because we live in a society and trillion dollar companies exploiting children for the crime of having negligent parents is bad.

The aim here is to protect the children. "Just let parents protect them" doesn't work when there's millions of parents that won't care.

More parents will care if you make it easier.