You clearly don't understand the intelligence process if this is your critique.

First, the people making the DNC hack report are not the same as the analysts who worked on Iraq. The IC is not a monolith.

Second, the Bush White House saw the intelligence they wanted to see.

Third, burning sources and methods is a very real concern in intelligence gathering. That reality can't be ignored no matter how much you want information to be free and open.

You don't have to trust the IC. In fact you probably shouldn't take what they say at face value. But there are very good reasons for why they operate the way they do.