People are so inured to the evils that they feel as if it were unreasonable, if not wrong, to complain of them.
 John Stuart Mill, Considerations on Representative Government (1861). copy citation

Context

“From despairing of a cure, there is too often but one step to denying the disease; and from this follows dislike to having a remedy proposed, as if the proposer were creating a mischief instead of offering relief from one. People are so inured to the evils that they feel as if it were unreasonable, if not wrong, to complain of them. Yet, avoidable or not, he must be a purblind lover of liberty on whose mind they do not weigh; who would not rejoice at the discovery that they could be dispensed with. Now, nothing is more certain than that the virtual blotting out of the minority is no necessary or natural consequence of freedom;” source