Daniel, pointing to one example of something you think the press covered inadequately isn’t much of an argument for why the mainstream media isn’t more reliable than complete fabrication. Do you really think that failure to cover an issue is just as bad as making stuff up?
In any case, I think you’re simply mistaken that the mainstream media didn’t cover the Clinton foundation scandal. Take a look:
Leftists actually think the mainstream media covered Clinton’s foundation problems too much, in comparison with Trump’s foundation problems which were (arguably) of greater concern, legally speaking.
The Washington Post article above cites hard evidence from a recent Harvard study that examined positive vs. negative coverage of both candidates:
As you’ll see, they each had about the same overwhelming amount of negative coverage, proportionally speaking.
As for the Clinton Foundation scandal, why don’t you take a look to see what the Washington Post had to say about it?: