From there it just talks about a lot of things we could do with a fraction of the wealth of the wealthiest 400 Americans. Things like ending homelessness in America, ending malaria worldwide, and many others. By mildly inconveniencing 400 people, who would still all be absurdly wealthy billionaires even if 60% of their wealth were taken, we could dramatically improve the world.
From there it just talks about a lot of things we could do with a fraction of the wealth of the wealthiest 400 Americans. Things like ending homelessness in America, ending malaria worldwide, and many others. By mildly inconveniencing 400 people, who would still all be absurdly wealthy billionaires even if 60% of their wealth were taken, we could dramatically improve the world.