"Such complacency" refers to a state of being too satisfied or comfortable, often to the point of being unaware or unconcerned about potential problems or dangers. Full definition
The outcome of such complacency will be that the generation of students attending university now will have to pay for higher education twice: once in the form of their own loans, and once in the form of cleaning up the debts left by this I.O.U policy. (theconversation.com)
Forward - looking in - house legal departments will not allow such complacency to continue indefinitely. (thinkaiforlegal.com)
The idea that the Christian life always includes sin allowed for such complacency. (religion-online.org)