That’s problematic. Someone might be using a pseudonym. It is common amongst writers, for example, who might write two different genres and don’t want to confuse their readers, who might pick up a gay erotica story where they might be expecting a cosy mystery.
The second Prime Minister of Australia, Alfred Deakin, had a long-standing gig as a correspondent for the London Morning Post and saw no reason to give that up when he became PM, often commenting anonymously on his own actions!
And even if someone is using their real name, then what if they just forge a certificate, using some printshop program?
Yes, we may be taken in, but what someone actually says may always be checked, and if they are talking BS, then it soon becomes apparent.