Well The Avengers did nothing to really prove themselves worthy of trust during AVX. Cap shows up on the X-Men's home island with hellicarriers and an army of super-powered being, then starts throwing ultimatums around "you will give Hope to us, this is not a negotiation," even after Wolverine told him mere hours before that that wouldn't work. Man, these big events really do tend to make Cap look like a trigger-happy moron don't they? In-character Cap would have been smarter/more reasonable than that (so would Scott for that matter).