A week ago, or so, I took my son to see the British Museum. I explained to him, in confident parental tones, the controversy about the acquisition of the Ancient Egyptian monuments, the Rosetta Stone, the Assyrian statues and the Parthenon Marbles...
... I am no doubt rationalizing, but I find that having these in one place made history come alive to my son, and no doubt the millions of other visitors. The fact that you
could (but shouldn't) touch them (except the Rosetta Stone) also made them feel literally more immediate, and the fact that the museum itself is free (assuming you can afford to go and stay in London for the day/weekend is another bonus for the place.
Yes, maybe they should be returned, and the museum emptied out, but if so many of the Assyrian statues would have been destroyed by ISIS by now. Many of the Parthenon marbles were destroyed by various religious groups over the years, and may have ended up in far worse state exposed to air pollution in the last century or so.
In summary, I have no ethical qualms about taking my son to see the stolen loot, and I recommend anyone with the opportunity to do so too.