Anyone who knows even basic terrestrial mythology knows the origin of the mummy's curse:

The origin is disease. Obviously. Specifically, Egyptian people were using mummy wrappings to wrap food. They were breaking apart ancient tombs and shrines and pyramids, going "oh, corpse, well, smashy smashy fun times, hey look, wrapping paper!" and putting it on their lunches. Then getting sick. And going "clearly, mummy tomb is cursed".

Meanwhile, the British went "you're smashing these things for fun, destroying them... And using them in foodstuffs? Okay... no. All that shit is coming with us back to England."

Flash forward several centuries, and you get "Waah, waah, our heritage! You stole it!"

I guess they wanted to use the stone sarcophagi and grind them down to gravel for their roads or something, and were short on rocks, so had to yell at the brits. They probably would have, not like they historically didn't pull that shit before. Even now just a country or two over, they're STILL grinding historical statues into rubble.