I have no problem with Ray. Players need to do what they feel is in their and their family's best interest and Ray, at that time, felt what was best for him and his was to leave Boston and go to Miami. No problem with that whatsoever.
But, there was bad blood before Ray left and his leaving exasperated the situation. KG and Rondo obviously don't like Ray and how everything went down. Doc may be their former coach, but these are grown ass men and I don't see Doc changing any minds anytime soon.