The unasked question is, “How much wealth is distributed by the top 2% through dividends, salaries, purchases and so forth?”
A corrolary question is, “How many of the wealthy have become rich in the last 20 years?”
Wealth is not static. It does not rest. It is a commodity and as such is constantly changing hands. The graph is a snapshot, nothing more.
Wealth can be a hoard of cash in the basement. How does that hurt anyone? Even if it's an enormous amount of money withdrawn from circulation it will just be replaced by the FED.
Maybe it is in real estate where the rich guy gave his cash to someone else.
Maybe he owns Microsoft, providing millions of jobs worldwide.
Maybe he trades his cash for shares in businesses providing the necessary financing for research, factories, or advertising to allow companies to grow and hire people.
Generally, the only way you will ever know a person is wealthy is if he trades his cash with others in ways that are visible. And it would appear that to anti capitalists, this display of wealth is anathema