Actually, no.
Day 1 - We are very concerned and will investigate.
Day 2 - The passenger was belligerent and I support what our employees did.
Day 3 - Mea culpa, mea culpa, we were wrong...
OK. 48 hours rather than 24. I obviously lost track of total elapsed time after seeing countless replays from different news services of an event in a very different timezone - some replays themselves were probably a day old.
The point is he has got to this point fairly quickly (couple of days), and he may (or may not) have initially been led astray by someone fearful this had all got out of hand.
7 days is generally considered a very rapid turnaround time for an urgent customer service complaint. Yes this incident was very high profile and hence very urgent. But it still takes time to get all the facts. Especially if there has been some CYA early on.