@jennettemariepowell - suppose I wanted to impersonate you after finding out what your email address is. Without the requirement to prove who I am, I would be able to do just that. I could then make bad comments that misrepresent you, but do so in your name. I don't think you would like that. I certainly would not. The login requirement ... for emails known in the databases ... is a good idea to make sure no impersonations happen.
Yes, having to login can be inconvenient. But that is how we prove who we are when we want to be ourselves online.