When you say identity, you mean “the identity of someone that convinced a certificate authority that they controlled walmart.com’s dns record at some point in the last 47 days, or used some sort of out of band authentication mechanism”.

You don’t mean “Walmart”, but 99% of the population thinks you do.

Is it OK to trust this for anything important? Probably not. Is OK to type your credit card number in? Sure. You have fraud protection.