Completely unnecessary.
OP is clearly addressing the current context in the United States. There is a blatant pattern of media analysis/trope/meme misrepresenting the level of violent rhetoric and actions in this country. It is very real, whether conscious on the part of the participants or not. Recognizing this is not "group narcissism."
Here's discussion of NON-equivalence in our current political context:
http://www.newyorker.com/online/blogs/georgepacker/2011/01/judging-from-his-internet-postings.html...and maybe the gunman had no idea why he was aiming for Giffords either, maybe he didn't know how she voted on health care or what her position on Arizona’s draconian immigration law was. It would be a kind of relief if Loughner operated not out of any coherent political context but just his own fevered brain.
But even so, the tragedy wouldn't change this basic fact: for the past two years, many conservative leaders, activists, and media figures have made a habit of trying to delegitimize their political opponents. Not just arguing against their opponents, but doing everything possible to turn them into enemies of the country and cast them out beyond the pale. Instead of “soft on defense,” one routinely hears the words “treason” and “traitor.” The President isn't a big-government liberal—he's a socialist who wants to impose tyranny. He's also, according to a minority of Republicans, including elected officials, an impostor. Even the reading of the Constitution on the first day of the 112th Congress was conceived as an assault on the legitimacy of the Democratic Administration and Congress.
This relentlessly hostile rhetoric has become standard issue on the right. (On the left it appears in anonymous comment threads, not congressional speeches and national T.V. programs.) And it has gone almost entirely uncriticized by Republican leaders. Partisan media encourages it, while the mainstream media finds it titillating and airs it, often without comment, so that the gradual effect is to desensitize even people to whom the rhetoric is repellent.