Humans or groups can be responsible for many foolish acts. Stealing is one of those traits. I am open to accepting this when referring to the British Museum. However, I am also open to groups of people DESTROYING historical items all because they do not share their culture or religious views!
Again, I see no issue in Countries like UK returning items that's not theirs but only under grounds that they will be SAFE in their new (returned) home. However, the middle east is mixed with different cultures -- languages and religions. It's also a place of much conflict.
As a British man myself and interested in Ancient Egyptian mythology, I would be just as much heartbroken of ancient items being destroyed. You don't have to be an Egyptian who's lineage traces back to this historical times.
Its sad, really. One of these days those pyramids will likely be destroyed. Perhaps by War. Perhaps by religious uprising.
Again - is "stolen" correct, here? If the British did not take any of these back with them, would many of these items still be around? It could have been destroyed of gone missing.
Just a thought.