If GCC had been more permissively licensed then Apple would not have released its Objective C compiler, which would have been a worse situation for everyone involved (to include Apple: they are simply wrong that a proprietary compiler is better for them).

GPL tries to make the world better, by increasing the free software commons. BSD tries to be neutral, but one should not be neutral in a war of good vs. evil: (cf. Ireland, Spain, Sweden & Switzerland in the Second World War or Sweden during the Cold War).