Honestly, capitalists ought to be able to develop something similar, the fact that a system that makes banks much more stable (and profitable) was imposed upon banks by FDR is definitely a strike against pure capitalism.
The only result of "pure" capitalism is a destroyed economy.
Capitalism that isn't properly regulated creates monopolies. That destroys capitalism.
Capitalism needs the free flow of money throughout the economy to work.
It also needs competition. Without proper regulations, competition is destroyed. Thus monopolies.
Business doesn't give a damn about our nation or anyone. All business cares about is money. When business isn't properly regulated, we end up with bank failures and economic crashes.
Unfortunately capitalism that isn't properly regulated forces most if the money to the top few which doesn't allow the free flow of money throughout the economy.
A stable and growing economy also needs investment. Not just in the private sector but in the public sector. Or we won't have infrastructure. That requires taxation to pay for it. A healthy economy and nation needs proper taxation to survive.
Properly regulated capitalism works. Just look at the stable stock market and banking system we had after the reform of FDR.
It wasn't until the Vietnam War, nixon changing us off the gold standard and the oil embargo that our economy started to have trouble. In fact a year after we changed off the gold standard the stock market crashed in 1972. GDP went from 7.2% down to -2%. Inflation soared from 3.2% up to 12.3%.
Then reagan came a long and made it worse with big spending, cutting taxes too much and deregulating too much. Setting record highs in deficits and debt. He set us on this course. The first bush, bush boy and trump have continued it.
We have been enduring the damage over and over ever since.