No more than working at BBC, MSNBC or FOX News causes a lack of credibuility. All are propaganda organs that are bias in favor of their respective interests.
Little to no difference.
"The problem is not that Assange told everyone what the US does. The real problem is that the US does the kind of bullshit it does. These activities do not promote American interests, nor do they help protect US interests.
If anything US foreign policy is risky, impulsive behavior on the part of unscrupulous, dysfunctional people who do not really understand their proper social function. This makes our position in the world far more precarious and it is readily observable that our leadership is presiding over a massive decline of our power and prestige due to these ill-conceived activities.
Shooting the messenger isn't going to fix our problems."