Essentially Brdjanin is not being allowed to cross-examine his accuser. At least the judge should have not allowed the interview to be submitted as evidence if the interviewer could not be forced to testify regarding it.
This is something of an exceptional case, though; the interview contains statements made by the defendant which are pertinent to the trial, and furthermore, it's a published account, so there's no reason it should be suppressed.
I don't think the journalist should be compelled to testify, however, because it would endanger journalists in the field (contrary to your claim, addressed below). Basically, it should be assumed that the journalist would vouch for the veracity of the story, and the defense, if they so desire, can call testimony that questions the journalist's credibility. There's really no reason for him to take the stand.
That said, there's plenty of reason for him not to. He's not just "hosing the bad guy" by not testifying; if he were to take the stand, it would certainly be to say that "what I wrote is true, he did these bad things," and that would fry him, too.
The reason this is ostensibly dangerous for war correspondents is that their work centers on getting statements from all sorts of people on all sides of the conflict. To do this, deals are often cut about what will be reported, "I'll print what you said but not mention the skull on your passenger seat," and things like that (admittedly, these are often "deals with the devil" that are morally questionable). But if journalists can later be made to disclose these things, to break these agreements, why would people ever speak to them in the first place?
In the end, it seems to be a question of expediency. What he published was useful. His full knowledge, field notes, tape recordings, etc, would be more useful, but if they were made available, it would occlude the ability to collect even the publishable parts, resulting in an eventual loss of useful information. By letting him off, the tribunal is very forward-looking; I hope they can convict this guy without the journalist's testimony, to allow war correspondence to continue safely. Er... a little less dangerously.
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