Blame successive UK Governments
The reason that traffic in the London area is packed so closely together and as a result incidents like this happen is due to a lack of runway space.
UK Governments of all political party's have been to cowardly to build the runways that London badly needs, the root of the problem is that we now have a class of career MP 's who's only aim is to stay in power by avoiding offending any one by not taking tough decisions.
Basically the attitude of MP's is the country can rot as long as they preserve their careers.......... There is not a statesman amongst them !