Finally some perspective. Yes, this was a mistake. Yes, this was a breakdown of separation. Yes, it's a serious incident. But part of high-reliability industries like aviation is the awareness that the operators are human, and that human error is inevitable whenever humans are involved. So the systems have defences in place to catch those errors before they end in disaster. And those defences worked.
Mr Sandilands clearly has a bee in his bonnet about AsA and in many cases that's equally clearly warranted. But this one isn't one of those. A controller made a human error and the system defences stepped in, more or less as designed. It's unfortunate, but it happens. That's why those defences exist.