This was discussed last night. The theory is that they used the plane crash to get federal jurisdiction for the island crash site.
That's the theory. The plane acrobatics was merely to tell us that the plane was NOT in control by some suicidal technician with video game experience.
It was remote controlled with the audio feed being fed in from somewhere else. Listen to the traffic tower recording. He is not manic at all, very scripted like he was going through the motions and saying everything a suicidal person WOULD say.
I'm very curious as to who these people think are protecting them.