I think you're kidding yourself if you think the western channels are paragons of impartial reporting. Sky TV reported on Iraqi PoWs and showed their faces until the Americans compained about Iraqi war-crimes.
Al Jaz represents the views of a large proportion of the Arab world in a way they like their news (public executions are still common after all). It's up to western channels to decide if they're going to replay these pictures or not. I wouldn't have seen the pictures of US PoWs were it not for the western channels.
The media plays a vital role in spreading the truth about things we don't normally get to see. War has always been ugly, the difference now is that Mrs Miggins gets to see what her jingoistic support of an unpopular war leads to.
While we may complain that the media is in the wrong, nothing will change unless we complain to them or turn off. Al Jaz will get it's just reward if it found to have done anything wrong because it will be able to be prosecuted through any decent court, unlike the perpetrators of the actual war-crime.