Not everyone can attempt Everest. Many don't belong, but they are still some of the very few.
Let's face it, many of those people have no business on Everest, but it's because they don't have the learned skills.
Every one of them is in superb physical shape. Most people could never, ever even hike up to 20,000 feet. I would bet that maybe 1 out of 200 or 300 could make it to that altitude.