One of the main reasons I current DISLIKE Matt Fraction's Iron Man arc, was because of the mindwipe idea and how he had Tony not LEARNED A DANG THING AT ALL AFTER ALL WAS SAID AND DONE.But Stark got his memory wiped, so people forgive him. I don't buy it for an instant. Then they had him and Cap and Thor get wrapped up in Thor's problems where the three came to terms with what had happened and all was well. Not a chance. Later on, Cap is shown as still not trusting Stark and Tony had to (and did) hand over information to Cap detailing how to disable his armor should he ever get out of control again. And then when The Hood started collecting infinity gems, Cap started showing his distrust of Tony again because there were supposed to be no more secrets... but they Illuminati guys kept the secret of where they hid the infinity gems after they had collected them. The real problem with the Tony Stark mindwipe excuse, however, is that regardless that he doesn't remember what he did during Civil War, his memory is what it was right up to shortly before Civil War... so there's no reason to expect Tony would do anything any differently now than he did the first time around because Tony believed he was right... and when he gets all self-righteous, he stands behind his "I'm a futurist" nonsense and does whatever he wants to do anyway. Sure, he has the benefit of knowing what occurred as a result of his actions even if he doesn't remember doing those things, but that just means he could decide to look for the flaws in his old plans and close them up if he ever decided to work against the other heroes again.
Maria Hill... there is absolutely no reason anyone should ever have trusted her. She's a S.H.I.E.L.D. agent and does not like super heroes. When she was in charge of S.H.I.E.L.D., she overheard information about House of M and decided that S.H.I.E.L.D. must know whatever the heroes knew... so she disabled Spider-Man and Vision who were working with S.H.I.E.L.D. in the middle of a different crisis, unmasked Spider-Man and then had telepaths scan his mind as well as search through the Vision's hard drives for information. Whether or not she had the right to do these things isn't the point. She's a government stooge first and heroes be damned if they're in her way of getting information. I think she was also in charge when the Cape-Killer technology was developed for S.H.I.E.L.D., and when the SHRA was still being discussed, she met with Captain America to get intel about which of his friends would side with the government and how easy it would be to take down the rest... when Cap refused to cooperate, still before the law went into effect, she order S.H.I.E.L.D. troops to attack him and treated him like an anti-registration criminal. Why would any hero trust her? Hell, even when Cap took over as top cop of America, I see no reason that he would want her around... sure, don't kick her out of S.H.I.E.L.D. because she was following orders and she's still useful to the agency... but why keep her in a high profile position? Why not relegate her to a desk job that has nothing to do with super hero activity? For that matter, why did he trust Victoria Hand at all? Okay, give her a second chance after having worked for Osborn during Dark Reign, but to put her into a position where she could have an effect if she were to betray? I'm beginning to suspect that Captain America might have suffered some brain damage when he was allegedly killed.
The anti-registration heroes who banded together could probably trust one another to this day... they had each others' backs when things were bad. Now that things seem to have reached a status quo, there's just no reason to believe people aren't going to hold grudges. Not the kind where they'll go out of their way to kick each others' asses, but there should be cold shoulders and nasty attitudes between faked pleasantries. Its all retarded, and if Marvel didn't want years of friendships ruined by Civil War, maybe they should have worked a little harder at making the event itself work better... or have resolved the events leading up to, during, and after a lot differently.
Which makes Tony a true one of a kind JERK and Fraction a hack of a writer.