A lot of these soldiers have been killing, raping and pillaging for a while now so (1) they don't want to give up the 'perks' and (2) if they did turn on the junta that might not be enough to save their hides when the people they've been stomping on are no longer restrained.
There are a few errors in this story I have been hearing aboutCOLONEL HLA WIN since Monday, he was not just a medium ranking officer, he was head of intelligence in the northern Rangoon area. There was finally a story about him in the Bangkok Post today. I did hear unconfirmed reports that one brigade in Mandalay did step in to protect the civs, and their comander was arrested, and another Brigade commander also, I believe the 66th and 99th Light Infantry Brigades, respectively.