No political government-- "government" or state-- is legitimate, credible, or ethical. Not one ever has been or ever will be. Because they are political. And if you remove the politics it stops being what anyone would generally call "government".
Those who want you to doubt that anarchy (self-ownership and individual responsibility) is the best, most moral, and ethical way to live among others are asking you to accept that theft, aggression, superstition, and slavery are better.