The few journalists I have known are all decent types, thoroughly professional and as fair and objective as it is possible to be. However, there are others who are also called journalists who are not so professional or objective.
A current issue of salon.com reports on the proliferation of stories about how Enron CEO Lay had been a friend of Pres. Clinton. Conclusive proof according to these journalists is that he had slept many times in the Lincoln bedroom of the White House. The idea, I suppose, is to deflect attention from the links betweeen Mr. Lay and Mr. Bush.
Since there are official records of who sleeps in the White House, the facts are easily checked. Lay never slept in the White House. Nevertheless, this misinformation has been published recently by the Washington Times, the Chicago Tribune, USA Today, and Fox News. The moral of the story is that we can't believe all we read, even if it has been published by a reputable news source under the by-line of a journalist.
Regrettably, the term journalist covers a wide spectrum of individuals including undercover agents, zealots, idealists, and a lot of decent, hard-working individuals. That there are unsavory types does not in any way justify violence against them, but it is one reason why combatants in combat zones sometimes suspect the motives and bona fides of people using journalist credentials. Perl may have gotten caught up by that suspicion. Actually, the most dangerous place for a journalist these days is in Africa.