Not only that, but more generally it seems to me that this "trust" system would cause a "bandwagon" effect on all posts. Other users would be afraid to downvote

Not only that, but more generally it seems to me that this "trust" system would cause a "bandwagon" effect on all posts. Other users would be afraid to downvote anything that was taking off, since they would knowingly be causing their own "trust" score to drop.