This is why we use listing companies like Bitquick (https://www.bitquick.co/) or LocalBitcoins (https://localbitcoins.com/)... so that the exchanging is done in private, yet is protected by escrow from the listing company.
,Even the listing companies you mentioned above have started requesting for forms of identification before any transactions.
Well, I feel its the best thing to do, despite the escrow system used by the listing companies.