I feel like it's crony capitalism, not necessarily direct capitalism. Ie, making it incredibly difficult for a small timers to start their own business do to extremely tough regulations to open a business, licenses and pattening costs, as well as high taxes insurance, and other fees that limit their growth potential. It's the old "lemonade stand" example. Not saying there shouldn't be barriers to entry for the safety of the public, but over bearing regulations and taxes make it tough to compete and give large businesses the advantage.
Greed and human nature effect both private and public organizations. But, public institutions are always are way more powerful that private because they effect the entire nation, not just people in the local area of the business. Its why so many powerful business leaders want to become public officials or lobby public officials. Then they can manipulate policies that help their business and make it tougher to compete for the small guy.
That is why the founding fathers of America created the system the way they did. They knew that public policies generally always stole more of their money to allow them to get ahead, so they created a system that allowed individuals to become wealthy. Which was nearly unheard of at the time.
Individual wealth is extremely important because it allows for an offset to egregious public policy and allows for the means of the public to monetarily stand up against a corrupt public authority. Thats why many socialist/communist policies keep people poor while their officials steal it all. This creates a weaker less wealthy country overall. It's why with 1.5B people China still isn't as wealthy as America even though they may have more billionaires.
IMO, another thing ruining capitalism is "market rate salaries" so all cashiers get $15 an hour at any business regardless of the size of business. Walmart should pay $25 and hour because they can afford it, and would get better quality workers, but the market rate is $15, so they pay $15 just like the small shop down the street. This keeps wages low for everyone in the industry because there is no wage competition among bigger stores. That's not how capitalism should be.
The true way to wealth is to create your own business. The harder it is to do that, the worse off a society is. That's why so many cultures from around the world have moved to America, so they can open shops and actually get ahead in life. It's the greatest system ever made, but its being manipulated as usual. There are so many wealthy people in America it would make your head spin, but I think there is such an emphasis on so many poor people that most never take a look around and see the individual wealth all around them granted to them by capitalism. For me, that is inspiration rather than envy.