this is the same argument as "why have government id cards, someone could just use a fake beard and use their older classmates id". Any system allows for some gaps, similar to how creditcard transactions make transactions safer but on either side of that transaction there some "insurance" and some leeway if someone really wanted to.

The difference is that I can’t mint infinite ID cards, and it is much harder to get a skeptical person to accept a photo ID of the wrong person.

> why have government id cards...

...for the internet is a perfectly sane question. There are good reason we don't have those as well and these reason vastly outclass ineffective user protections.