1. It sounds like they'd have to be pretty well targeted against the precise systems of that particular company in order to work. Which would tend to suggest more targeted spear-phishing attacks and extensive recon being done against the company systems somehow before anybody launched a real black-hat attack.
2. At that point, it feels hard to blame the individual employee versus whoever misconfigured those corporate services in the first place. Though I would guess it's fairly common for those kind of things to happen due to many systems being set up without the help of true experts and the unlikeliness of a real attack against them without either a highly-skilled black hat targeting them or securing the services of a skilled and prices pen test team.