Things in museums that still exist in preservation and study, though, instead of being destroyed.

Yeah, but that's not what happens in a lot of cases. A lot of these cultural relics were stolen from countries that were already preserving their own history.

A lot of the stuff currently in European museums weren't items "saved" by old timey history professors. A lot of it was captured directly from cultures europeans were attempting to colonize from the 1500-1800s.

For example see what happened when France attempted to colonize Korea In 1866. They were chased out of the country, but on the way out they stole one of the countries most important royal artifacts. Something the French only recently returned "on lease".

Modern Egyptians have exactly as much conquering relation and unconnected culture to the ancient Egyptian civilizations who created those artifacts, as the British did who collected those artifacts when Egypt was part of the British Empire (well, Ottoman, but actually controlled by Britain),

You don't understand how modern Egyptians are more connected to ancient Egyptians than the British?

You do know that Egyptian is not an ethnicity right? That the Egyptian empire spanned thousands of years and was headed by multiple different ethnicities throughout that time? Egyptians are people who live in Egypt, it's not a racial or ethnic designation. So yes, modern Egyptians are more connected to Egypt than people currently living in London.