Admittedly, America dropped the ball, tripped over it, and broke it's nose. However, lets not forget that the WHO was also wildly irreaponsible by not declaring this a pandemic sooner.
How have they been "wildly irresponsible"? Placing a label on the whole crisis is a rather symbolic act. Important was and is to spread the available knowledge, tests, and know-how.
They shouldn't have just relayed whatever early study came out that was most likely trying to play down what was happening there. And if you add up their mysterious 'typos' and their other efforts to please/appease the Chinese government, the WHO comes out of this with little credibility left