As a person who has been involved with an riot in a small town, I think that, in the deep unconscious of most folks in the US, is something structure:
"well, there wasn't violence in the 19th and early 20th and mid 20th and late 20thC century... well okay, there was violence but they put folks who were resisting into mass graves or incarceration and everyone was better off for it".
That is, consider that the obverse of your claim might be true:
the violence committed by the US has been so totalizing that it's victims have never even counted as victims and that holocaust so complete that it only exists in the subconscious of white US citizens.
I find that idea to be a very easy way to understand why white folks are so passive and pro-authority.