I think this all comes back to Perez and the preposterous, delusional arrogance around Real. Perez has publicly made this a vendetta against Higuain, simply because Higuain has made it know that he would like to leave - the outrage, how dare a player want to leave Madrid! Perez has stated that Higuain must apologise publicly for asking to leave, and be grateful that he is Madrid player no matter how much playing time he gets.
The way Real Madrid is run is a joke, we all know it. The presidents and executive management always regard themselves as the most important people at the club, which in turn they regard as the most important in the world. I doubt they would be doing this if PSG and Monaco weren't preventing Real from just doing as they like and rail-roading other clubs into selling their best players for knock down prices.
If Real had been able to buy Cavani at the price they wanted, Higuain would be an Arsenal player already, but the only big star possibilities remaining are Rooney and Suarez (assuming Bale is a non starter this season.) Perez needs to save face now, by making sure that Higuain bows and Real get a win in the transfer market.