FAA: Top ten accident causes

Capt. Geoffrey Thorpe said:
1200 total accidents, of which 4 are mid air collisions (numbers from 22nd Nall Report) - how do mid air collisions make it on a list of top 10 accident causes?
If one makes the categories general enough, then the total list of categories becomes so short that low probability events make the top ten.

I think that is the case here.
 
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