Obviously, people's minds are quite appropriately focussed on this most recent tragedy, and any loss of life is a bad thing.
However, taking the longer view, is there really a disproportionate number of mid-air collisions under the LTMA? Midairs are thankfully surprisingly rare in any event, and I don't recall a cluster of them in that neck of the woods.
By contrast, there is a relatively larger number in ATZs between aircraft joining, leaving and participating in the circuit pattern; just the time when people should be most aware of the position of other aircraft.
2D