I don't find the thin blue line motif offensive, but it is not part of their uniform. No badges, stickers, logos or any other slogan or design should be added to the uniform. If the rule is relaxed for this admittedly worthy reason, it will lead to all sorts of badges being worn for reasons we don't agree with. Soon we will have police pinned with Pakistani Independence Day badges, World AIDS awareness Day badges or Greenpeace badges. So there should be no exceptions to this rule.