Here's what Breevort said in the commentary for Avengers vs X-Men 3:
"When Cap said, "Avengers Assemble" and brought the troops in to essentially take control of Utopia, he wasn't doing so with the intention that anyone would go in and kill, not just Hope, but any of the other X-Men. Wolverine, though, went off on his own and played a lone hand, because he feels like he's got the experience and knows ultimately what has to be done, and that the other Avengers are going to hem and haw before they do the thing that has to be done.
That does not sit well with Cap. He is not the kind of person who believes the only way to solve a problem or situation is to kill something. He will always try to find another way to get the job done. So this brings to a head the conflict between these two characters.
Wolverine is doing what he feels is absolutely needed and absolutely justified in order to save the greatest number of people. He's expressed no reservation in terms of his opinion of Hope. It goes all the way back to the X-Men stories they've been in together before "AvX" started. He's been pretty consistent in terms of his position. Sooner or later, the day was going to come when he was going to have to put her down, and this is really just him carrying forth on that. This isn't something he wants to do or looks forward to doing, but he believes is a necessary thing.
And Cap, at least at this point, does not agree with that assessment. So the fact that Wolverine took advantage of the Avengers' assault as a diversion means that Wolverine is somebody that, while an Avenger and trusted soldier fighting side by side with him, is somebody who at this moment Cap cannot trust." http://www.comicbookresources.com/?p...ticle&id=38647