The lie isn't that America has done terrible things.
Plenty of Americans will acknowledge that.
The lie is in the grammar used to acknowledge it.
"Mistakes were made."
Not: "We made mistakes."
Mistakes were made: passive voice, no subject, no agent, no one responsible, the action floating free of any actor, the harm acknowledged while the accountability evaporates.
"That was a different time."
"We've moved on."
"Why do you keep bringing this up?"
This is not guilt processed and released.
This is guilt managed, contained, made grammatically harmless.
The exceptional nation does not confess.
It contextualizes.
And then it asks you to admire its honesty.