Such a relic ought to be shown without jewelry, etc. blocking a clear view.
And what’s this, King Louis busted up the original crown?
Even on the view (which I share) that these relics have no supernatural powers in themselves, one would expect at least as much respect as a museum would give any item involved in an important historical event.
If it is a real relic (I doubt it), it actually might have some power, though not of its own, but God's through it. I can never remember if it's Acts 18 or 19, but there's definitely Scripture testifying to the healing of the sick by placing handkerchiefs of the Apostles on them.
And yeah, the vandalism bothers me too. I'm sure Louis DID belive in the 'divine right of kings', but that's taking it a bit too far.