Why are the NBA officials are low keyed/quite people off court?

Are they not allowed for interview and talk about the games afterward by the NBA unless they're on the court only? Players,coaches and even management are allowed to speak to the media to get another perspective or to get their points across(JVG), so why not the official do the same? I rarely ever seen NBA refs/officials individually communicate with the media. Are they afraid of something or someone(Stern)? I for once liked to see them talk about their own officiating in reference to diffrent player type and see what they had to go through in each and every game. By doing this maybe we could understand them more instead of holding off and letting the world believed that maybe there's a conspiracy in the NBA, one that is fixed. These are veterans grown men who has been involved in the game for a long time and its fishy to me that thet can't defend themselves instead to have the commissioner stand up for them everytime when things gets in their way. They're human just like everyone else on the court and they could make mistake just like anyone else , but they still get special treatment from the NBA more than anybody else? Thats BS...