Yes, but this is a problem that will only affect Google employees, not the world at large. Steve says he meant to be signed into his internal Google account, not his external Google account.
Yes, but that's true of anything, right? You could accidentally misread a traffic signal and drive into the middle of oncoming traffic. But like with sharing on social news sites, you can usually recover quickly enough that it's not a big deal. Slam the brakes, delete the post, etc.
People make mistakes and no software can prevent that.
