Except how they went out of their way to help turn the Mist cloud from Madrid as soon as Storm informed them there was a problem (a problem that didn't appear until after Muir Island, despite the Mist Clouds having already past through several cities, including Tokyo, without incident), and used Downer's power to put the entire city to sleep to stop a riot and prevent people from getting hurt. You know, the riot Cyke-Frost started in the first place? People really reaching to paint the Inhumans as the bad guys here.
The Inhumans goodwill dissapears when their first reaction when one their clouds is destroyed is to shout "You have made an enemy of us FOREVER!" and then kill "Cyclops".
And then in their own comics when questioned why don't they just destroy the cloud Medusa just say "that's sacrilege for some of us, the clouds are sacred!". She admits that their religious symbol is more important than an entire species.
EDIT: And yes, Black Bolt kills Cyclops after he started charging his optic blasts, but Medusa gave him the order before that. And they attacked Sunfire and Alchemist unprovoked.