It was an airshow. It was almost certainly the Commemorative Air Force flying those airplanes. They used to be known as the Confederate Air Force. It was probably during the part of the show where they do their Pearl Harbor portion. (B-17s arrived at Hickam Field in the middle of the attack. They were low on fuel and had to attempt to land.)
Those demonstrations are heavily choreographed and the collision was almost certainly inadvertent. There is no way the pilot of either aircraft would do something like that intentionally. It was almost certainly the fault of the pilot of the smaller aircraft. We'll probably never know exactly why it happened.
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