It's a practice real museums have mostly stopped. There's enormous controversy about what they should do with their existing ill-gotten gains -- most prominently the Parthenon Marbles in the UK, but that's just the lid on a massive can of worms. (There are rumors that Greece will hold up any trade deal the UK wants to make with the EU until they give the pieces back, and expect all hell to break loose in the museum world after that.)

The Bible Museum reflects a cultural attitude the celebrates the imperial age, when rich countries just took what they wanted from poor ones. There are a lot of people in those rich countries who want that back.