Just adding
to what John says, I think the Right reacted the way they did to the DHS report because A) they're most happy when they're victims and B) they've spent years equating The LEFT, which is everyone to the left of Joe Lieberman, with Some Random Nutcase With A Sign Somewhere and Anyone Who Did Anything Bad Ever, that they assumed that the DHS report, even though it was written under the Bush administration, was doing something similar with The Right.