1:What was the captain thinking?
That's what the investigators are looking into.
2:Why didn't the F/O question the captain during the approach?
He did. The contents of the CVR is however still not open to public discussion (Not included in the preliminary report) other than that the F/O did question the captain, and in the end he called a go-around but didn't do it/didn't take control.
I would be surprised if any asian-management airline has more than something like "CRM is good and should be used by pilots to assist safety" in their Ops Man's (but more than happy to be corrected.)
There are F/Os who has walked out of aircraft in a/as a result of poor CRM by the captain in Indonesian airlines, and who got the can? The Captain.
Now after seeing the preliminary report, and other data from this accident presented in front of me, the case of GA200 was preventable, the F/O called the go around, but him not having a stunning record himself, was afraid that the captain would pull the rabbit out of the hat on the last moment so didn't take over even when it was obvious that the aircraft had violated GA's SOPs. To partly understand the partial incapacitation, one must look at the data from the initial descent phases. Out of ordinary wind above 10,000ft on the descent started the stress increases early on. The aircraft hit the right VNAV profile albeit a little fast at 9000, and then at 4000ft@8DME to JOG VOR, the "wild" speeds started after that, in that they were not configured quickly enough but decided to chase the visual slope instead. From 3500 - 1500ft, the altitude/speed trade off resulted in the aircraft peaking at 280 knots IAS during this stage, but from then the speed bled off gradually and the aircraft was on slope on the last 200ft... but with the speed, it was at 3000fpm ROD.
Talking to some sources within GA and the investigators reveal that it is their opinion that the Captain suffered from partial incapacitation and the F/O did not take the required measures until it was too late. The GA accident has little to do with the problem of "real men don't go around."
PK-KAR