You don't have to understand why the RAF won't accept asthma in its aircrew candidates, you just have to accept it and find something else to do with your life.
I am willing to bet that nobody has ever had the balls to officially challenge the Services on their policy regarding 'childhood asthma'.
It's not a question of 'balls' Typhoon, it's having the sense to realise the inevitable and to move on with your life.
But those higher up the Chain of Command won't budge....
You said it, so accept it and move on with your life.