I like many of your points. I can even go along with the idea that some of the taxation and corporate laws started out on a socialist ideology. But today's laws and taxes have more input from the corporations themselves than from any social ideology. Lobbyist is a 4 letter word. I rely on the SNC Lavolin example as a company way too influential in today's politics. Yes get rid of the stock market.
Corporations are neither capitalist nor socialist. A group of people working together for mutual benefit is the basis of all human interaction.
THe problem is a system of LAWS, which allow humans to do things under a corporate structure that they would never be permitted to do on their own. Corporations exist to shield individuals from liability for what would otherwise be illegal. A system which shields people from wrong doing at the expense of everyone, can not lay claim to being capitalism. Not is it inherently socialist.
Capitalism is simply a system of privatized risk taking which earns privatized profits. Socialism would comparably be a system of socialized risk taking which earns socialized profits. Neither system on its own is evil, and either could work. The trouble is where government gets involved and perverts both ideologies to displace the risk and profits.
IN most countries claiming to be capitalist, you have corporatism, where through corporate structures you have individual, corporate and governmental risk taking, and if successful the profits go to the risk takers, but if unsuccessful the losses go to the taxpayers. In most countries practicing some version of communism, what they have is the same kind of risk taking, but the profits go to the party while the losses to go the workers.
The only real difference between 'communism' as practiced in the later half of the Soviet union and the current 'capitalism' currently practice in America is the mechanism by which people access government power and risk transfer mechanisms.
In the west we have lobbying, which at face value isn't the problem. The problem is politicians who let themselves be influenced by lobbyists. Under communism, they had party membership and overt bribery.
Objectively, the problem isn't whether you want to focus on individual rights or groups rights. The problem is when the government uses a monopoly on violence to deprive people of the fruits of their labour.
The whole capitalism vs communism debate is a distraction to keep people focused on anything from the true source of oppression misery and death, and that is government.