Our line of business has reviewed the results at a team level (10-15 members) level up (180 employees) and compared to ratings from other similar companies.
My manager sets a plan to address areas that are lowest performing directly for her, and then reviews the stats for the team as a whole to understand if there's something our team is doing well but the larger (180 employees) group is performing lower (i.e. discuss best practice).
Not providing a completed survey is as useful as not voting in an election; you don't have to write something salacious to get 'in trouble for' while providing a 'rated' feedback. Be honest, but not out of line.