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Google should have add this feature long ago, people have been abuse the labeling system for so long. You can actually mark all labels as spam in all videos, and they will (temporary) remove from the video’s labels.

I'm glad they've added this. It was really needed. But they do need to clean up the interface. It's so cluttered.

Can't they try checking for different IPs in the first place, so that only the nth person to add a specific tag will trigger the tag to be used? (Unless they already do that, too.)

Or why not just launch Google Video Labeler where you have to write as many labels as you can think of for the duration of the video?