Having been to the Parthenon and the British Museum, I'd say the setting in Athens with the actual Parthenon and the Museum there is vastly more impressive than the way they're displayed in London.I’ve seen them and never set foot in the British Museum. The remaining carvings in the frieze are still on the Parthenon, not having been hacked away by the equivalent of grave robbers.
The next generation can easily fly, or drive to Athens, via ferry, to see them as they should be seen.
The Greeks were occupied by the Ottoman Empire at the time of the theft, so weren’t in a situation to ‘take care of them‘.
I'll admit that the main attraction of the Acropolis museum (or whatever it's actually called) for me was that it has air conditioning. It was 42c the day I was there.