Do we have to display skeletons to be reminded of death and that we are on this earth for a limited period only? I don't think so because believers are usually reminded of this in their scripture if they read it.
As for those who don't, they don't even think of death. However, I strongly believe these bones should have been left where they were buried in the first place. We have no right to touch something sacred like that which belongs to someone else.
Anyone should obtain permission from the family of the dead or the owners of these bones to touch them but the dead can't talk.