"Public indifference" refers to a situation where most people show little or no interest or concern about a particular issue or topic. It means the public is apathetic or doesn't care about something. Full definition
Given the depleted state of the Treasury and a long record of public indifference to space programs, doubts about fulfillment of the moon - Mars plans are abundant on both sides of the political aisle. (discovermagazine.com)
American military operations can succeed despite public indifference or incomprehension — provided the wars are relatively quick and / or painless. (firstthings.com)
All this diplomatic turmoil is proceeding against a backdrop of growing public indifference. (firstthings.com)