There are uncontrolled airports here yes but I haven't seen any with airline traffic that were uncontrolled during the time of airline operation. In fact even

There are uncontrolled airports here yes but I haven't seen any with airline traffic that were uncontrolled during the time of airline operation. In fact even when a private jet would come in after hours the tower would be active. It was really for all kinds of commercial activity. I'm not saying that Europe is better at this than the US but I do think it makes sense to have someone watching especially to ensure separation of traffic as you say. Especially with something as big as an A320. In this case especially a tower assigning an active runway would have prevented the Beechcraft approaching from the opposite direction. I have to say also that GA is not as big as in the US and that makes GA pilots in general less vigilant and experienced with proximity to airline traffic so that's another factor.