Another helped return works that were looted by Napoleon during his campaigns (my grandmother had one of Canova’s Ideal Heads which the ancestor received as a gift from Canova for returning those artworks).

This stuff is pretty complicated, simply returning it is not possible, for example with ISIS purposefully destroying historical artefacts.

Having artefacts in foreign countries is, in my opinion, a net good. It exposes folks to cultures that they would not otherwise get to see.