>I didn't say the "aggregates" produce an unbiased result.
This is correct. I didn't quote you. I'm saying that in order for your conclusion to hold, the above assumptions must be true, which they're not. Whether or not you stated the assumptions is irrelevant.
>Seeing different opinions exposes to you the biases of every news source. If you just watch foxnews or cnn all day, you won't be able to pick up on the bias. But if you watch both, the biases of both become blatantly obvious.
There is zero reason to believe that watching one source will accurately expose the bias in another source, rather than simply contradict it. What I mean is that watching multiple news sources will not necessarily help you distinguish fact from bias.
To give an example, if news A presents a factual statement, and news B presents a lie that contradicts A, you are no better off by watching both news sources.
My statement has exactly nothing to do with "mainstream media." I'm just addressing the fallacy stated above.