[SimbaOnSteroids]

When anonymous feedback comes in and its taken and acted on positively the team may be more likely offer up non-anonymous suggestions, a foot in the door if you will. I may be totally off base though I don't have that type of real world experience.

[aphextron]

This is basically how I feel about it. If my employer acted positively on some anonymous feedback at a first, I feel like I'd be a lot more likely to feel open and willing to engage knowing there's good faith. Unfortunately this doesn't scale to larger companies, though. What the OP is describing is the classic problem of management.