It's not that you can't eat them, statistically you're not ultra likely to get sick - but the chance is there, and no one can guess how sick you'd get.

They have small disclaimers at the bottom of their menus making it so you can't hold them responsible for your ordering undercooked meat or eggs.

The customer is always right in matters of taste, so restauranteurs just make sure the customer can't sue for any potential food poisoning they get.