There's always a slant, which you have to take into account. What's upsetting is when some so-called journalist conveniently forgets to check primary sources and, instead, uses the "unnamed officials" ruse.
At least Hersh (sorry, I misspelled his name before) comes closer than most to naming names, which is, of course, a sure way to lose story sources when dealing with sensitive national security matters. And in his long career as a reporter, he must have a pretty good file of contacts by now.
I don't dismiss all Left wing writers as inherent liars. That would be the act of an ideolouge and to be conservative is to, above all things, not be an ideolouge! But I am skeptical of an author like Hersh who always seemed to defend a regime like the Soviet Union and their minions during the Cold War.