You appear to have a different definition of "embarrass the government" than I do. Embarrassing a government is an action that they are willing to kill people over (like reporters). There's a big difference between leaking state secrets that materially harms the government and poking fun at them. One will get you disappeared and tortured-not-tortured, the other is a useful distraction.

Lions don't attack every animal that sets foot on their turf.

The release of "Collateral Murder" damaged public opinion of the US invasion of Iraq and US foreign policy in general. If journalists embarrass the US government by telling them their nose looks funny, Assange embarrassed them by pulling their pants down at the half time show at the Superbowl.