"It actually wasn't badly researched at all,"
Yes it was.
The system is not perfect - none is. There might be a mid-air one day; I doubt if a couple of pile ups on the M25 will have any bearing on it.
The BBC set the agenda for this. They contrived a scenario which in many respects, particularly ATC, was complete tosh. If people who know better criticise that it is no argument to say the scenario is not the issue. If the issue is an inevitable mid-air then they should state as much and then justify it.