Do you seriously think any country is going to say anything about their capabilities and whether or not equipment was turned on or off?
I believe the ACARS like anything that is made can be defeated, by loss of power if nothing else.
Those arcs you see are based entirely on assumptions of contiuous flight in one direction. The aircraft could have flown in circles and crashed anywhere along any part of the arcs. There is nothing in particular about the terminal end of the southern arc other than 2 pieces of debris which do not fit with the facts.
Yes -- radar is radar. It has no political predilections.
If a plane travelled through their airspace undetected by simply turning off its transponder then it doesn't speak highly of the military defense prowess of those countries.
If anything they have a vested interest in saying they saw it and recognized it as an airliner full of people and let it pass through out of deference to humanity. But not one country sent up a military plane to check it out which they would have done if it invaded its airspace.
Thailand has just come out and said that they did spot it but since it wasn't invading their airspace they didn't bother with it as it was none of their business. Cross over their land and it would have been a different matter -- and they would have responded.
Yeh -- it could have flown in circles but if it did it would be nowhere near Pakistan and would have run out of fuel a lot sooner than 8:11. No one has yet debunked those arcs as the first two are verified by both Malaysian military radar and the Malaysian Airlines and the rest follow from that.