The way things happened was the following: Alonso arrived at McLaren with his 2 titles and expected a rookie teamate that wouldn´t be a problem for him. Turns out Hamilton was much better than he expected to be and it was very close in the standings, and there was growing tension. Meanwhile Ron did nothing.
At Hungary during quali is when things exploded. Hamilton blocked FA in the burning fuel laps forcing him to do his attempt heavier than he should have been, the team repeatedly told him to move over and let Alonso do his quali but he didn't. Now the quali strategy was ruined.
After quali FA got a 5 place sanction from the FIA for "blocking" Hamilton. At this point FA went to talk to Ron and that's when it became clear that Ron had chosen to back Hamilton and that Lewis will be his n1 driver.
It's OK to have a n1 driver, Ferrari did it for years with MS and it worked well for them, but you cannot be a hypocrite like Ron and claim to support both drivers when you do nothing when one screws the other.
McLaren had a car and 2 drivers capable of winning the championships, and yet they managed to lose both and Ron can only blame himself for that.