“Scare” Quotes

“SCARE” QUOTES….BBC headline this morning:

US troops ‘kill Iraqi police’

(As of 10:14 am Pacific time.)

The “scare quotes,” as the BBC-o-phobes like to call them, are there to indicate that someone says this has happened but the BBC has not itself been able to verify the matter. The information in question came from “Iraqi sources.”

Question: is it OK to use the quotes here? If so, why is it “anti-American” to do the same when the source is the U.S. military, which is also ? sometimes deliberately, sometimes not ? known to be less than 100% accurate?