Do they not have conditioning air available in Bankok?
I agree with the second point, but since all our routes are central Europe we are fine without an APU since there are plenty of airfields should we loose an engine. I have often dispatched with inop APU, it isnt a no go item in our MEL.
At the end of the day on a 2 engine aircraft, if you loose an engine you are going to be looking for an alternate airfield. Only having one operating generator and no APU wouldnt be my prime consideration at that stage.