I'd say they don't want it to look like it was ever a credible threat.
To discourage a repeat?
Because if they bring that into evidence then they must arrest sitting congresspeople and senators and they are to damn chicken to do so?
To encourage a repeat by ignoring obvious conspiracy and plans?
All I know is the civil war continues and most don;t even know we are in one.
@rpardee
It appears most of the evidence falls into the category of rhetoric that clearly influenced them & put the thoughts in their heads, but amounts to undirected bravado.
Any reasonable person would see it as indicating possibilities that LE *should* have been prepared for - but not any sort of organized or detailed planning.
It seems like there might also be a strong effort to hold those cards & follow back to the influencers that carefully placed the thoughts that led to the actions.