The comment above me was the one that said Tony's reaction to his parents' murder was enough of a reason for Steve not to tell him. If that's the case, then it is pure cowardice. If you're going to back down from telling the truth about an innocent woman's murder because you don't want to face the reaction to it, when you have willfully torn down entire government agencies for treason yourself and damn the consequences, then you are a coward. What the hell was it about Tony's potential reaction that he couldn't have just faced, instead of lying and keeping silent and letting the murders go without justice or even acknowledgement?