"The problem is absolute power. When the capitalist or any other have absolute power that's when the unfairness prevails. It is possible to set limits to the capitalists, checks and balances that protects all members of society, while offering opportunities."
impossible under capitalism, the checks and balances must be in the favour of the capitalist. Otherwise the capitalist class literally couldn't exist. This leads to a complete capitalist control of any government.
Look at chile when they elected a socialist. The capitalists simply paid the truckers to stop moving food and other essential items. The entire country ground to a halt and the people started starving until the government did what the capitalists wanted, taking out the (democratically) socialist leader.
https://www.marxists.org/archive/lenin/works/1916/imp-hsc/
this book talks about how imperialism is literally the only outcome other than collapse for a capitalist society.
It also doubles as a book explaining how "free-market" capitalism will lead to monopolies no matter what.