Capitalism is kind of like a control system that selects for accumulation and profit. The ones at the top are those that have been filtered for, and have the most. If they fail, they are filtered out. This is why Marx many times explained how capital itself is above individual capitalists. I recommend reading Marx on Capital as a Real God by Ian Paul Wright, for a bit of a funky explanation of this.
The processes of capitalism demand reproduction on an expanded scale. Simple reproduction on the basis of capitalist development isn't really sustainable, they are propelled forwards. In other words, grow or die, at economic scale. Individual megafirms, the ones with the elites at the top, have to continue growing and swelling until they burst, because they are not the masters of capital. That doesn't make them guiltless, but more like priests of capital, as Roderic Day puts it.