That is not a defense for anyone trained in generally what constitutes classified information. It is not the marking that makes it classified, but the content. Passing it around unmarked is not an excuse, but itself a violation since properly marking classified information is a responsibility of anyone handling it.
Don’t forget, as Sec State, she was an OCA - Original classification authority.
She is responsible for establishing classifications for information generated within her purview.
I am rather disgusted with the talking heads whenever this comes up on the news.
This situation, as with so many others throughout this administration leaves me wondering whether they act with malice or if it is just gross incompetence. And then, over a glass of wine, I will then remember the two are not mutually exclusive.