Devid Goldberg said something about AJ that we should take note of.

Basically, AJ's job is to play for Israel. He is authorised to tell us any other secrets but Israel will be protected by him.

Now, something similar could be behind Goldberg, himself. Anyone with a voice could be telling us mainly the truth except for one small area in which we get disinformation. The moral is to not fully trust anyone.

The other point Goldberg made was that some channels of communication are created just to see who listens to them. A honeypot, if you like, that will provide lists of different flavours of dissidents.

So, to me, all questions about who should be believed are not useful. You need to employ the scientific principles as explained by Richard Feynman. He said the first thing a scientist does is make a guess about what the truth is then he sees whether that guess fits the facts. If it does then it was a good guess. If not then it wasn't!