>>95737531they knew it was killing people and the Inhumans were fine with that.
What they didnt know is it was reaching a saturation point and would kill all mutants on earth in 2 weeks, only at that point they thought it was ok to destroy the cloud.
But having a cloud the size of Australia roaming the world and killing all mutants who didnt manage to escape or move to another place temporarily, was ok for them.