The big problem is that once someone gets a big pile of money, it is easy for them to use that to generate even bigger piles of money.
Also, the more money you make, the more taxes you can dodge. Your small business owner is scrambling for every dollar they make. While your average mom and pop places stuff cash under the drawer hoping the IRS doesn't notice, Amazon and Apple pay nothing in taxes.
While all this goes on, the middle class shrinks and loses purchasing power (our meager wage increases often don't even keep up with inflation), and the national deficit just keeps exploding, all to benefit the very, very top few. If the debt were shrinking and the middle class were at least getting a piece, that would be different.
The rich will fight back calling anyone who brings this up a "socialist anti-capitalist", but of course that's not true. Most of us just want to fix the system to make it more fair. Close your eyes for a moment and try and think how many Apple products are within a 300 yard circle from you. Now think about their tax bill of $0. That's not capitalism, that's corporate socialism. The state exists to benefit big business.