There is also a rather ghoulish set that think it "cool" to have human bones as souvenirs of their visit.
The US Park Service and the FBI arrest several such looters (and their customers, for those who loot for profit, rather than "kicks") every year... and not just with ancient remains.
Revolutionary War sites, Civil War sites, "Ghost town" graveyards... and many others are targets.
If those remains are allowed to rest in such an accessable location, without protection, then sooner or later they will be disturbed... and maybe looted.