When something 'evolves' into something else, it is no longer what it was. Capitalism cannot be faulted for un-capitalistic things, that's like blaming a drought for drownings. Christians cannot be faulted for what churchian pretenders do, either. The 'no true scotsman' fallacy requires moving goalposts so the 'true scotsman' can never be held accountable, but Christianity is pinned down to scripture, and capitalism is almost as well defined. Hold Christians to the bible, and capitalists to private ownership and free trade, and a whole lot starts to make sense -- for many of those who call themselves either, are neither.
You complain about 'the companies', but they only exist as they are as a direct function of government intervention. You say the companies 'make' government act in their interests, but this is false -- they influence humans to make irresponsible choices in elections, and influence human politicians to make irresponsible choices in governance. All of this come back to the morality of the people, or the lack thereof. Moral people would balk at well-advertised scum, and moral leaders would balk at immoral incentives to abuse their station.
If we were angels, 0% of what you describe would happen. We quite obviously are not, but blaming 'the companies', abstract legal constructs, for what we the people do, is lazy bullshit. It allows you to slide away from the question of personal morality and tilt at an abstract windmill. "The companies" are the safest target on the entire planet to complain about fruitlessly. The real problem is the people: any system of ownership and trade, from capitalist to communist, will fail when operated by selfish fools.
Humanity was wretched in pre-Christian times, and that wretchedness did not go away in a single generation. It took more than a thousand years of both Christian morals and eugenic population change to get us to where we were in 1900. It should not escape your notice that when we started sliding backwards was precisely the time much of the West decided they knew better than Lord, embraced the Synagogue of Satan, and worshiped money and material 'progress'.
It can be blamed when it is capitalism causing these un-capitalistic things. That is like saying that Communism cannot be blamed for genocides, because Communism as an ideology does not call for them. Sure, its theory did not call for genocides - but its practice nevertheless resulted in them.
It is same for capitalism: if capitalism is not regulated in some way - be it by border controls or something else - it invariably destroys itself. Unless it is a sort of business that is by its very nature conductive to small enterprenaurship, rule is that if you don't grow, you disappear. Goal is to establish a monopoly, but establishment of monopoly means death of capitalism, especially since easiest way of establishing a monopoly is to coopt governmental help - which then leads to socialism.
As for morality of the people, you have to understand that humans are not moral by their nature. And especially people who seek power cannot be moral. Democracy causes degeneracy in more than one way. First, because it brings psychopaths to positions of power. To gain power in democracy, you first have to want it, and then you have to lie, cheat and steal your way to it. So if you are saying that return of morality can somehow solve problems in politics, you are making an account without a bartender. It can never happen, at least not in a democratic society. Traditional monarchy can avoid it, some of the time, but that requires traditional society - which means no capitalism, or at least none of the modern capitalism, because capitalism - with its freedom of movement, freedom of choice, and compulsion towards equality so same things can be sold to everybody - destroys everything traditional.
You admit that we are not angels, but then you do not follow to what that means for your theories. Fact is,
concentration of power is bad, whether it is in hands of the state or in hands of a large corporation. People are always going to do bad things, but pretending that organization of society and tools available do not matter is simply wrong. Large corporations want large government by their very nature, because large government can easily be bought and made to tailor laws which fit their needs. Large corporations and large government alike hate competition - they are already dominant, and have no interest in allowing any competitors that might endanger that dominance. Morality cannot change this, because this system
destroys morality as a function of its existence.
Again: humans are selfish fools by nature. Introducing moral code can help, but if the society itself is set up in a way that is rotten, moral code will not last. It will become rotten itself, as has indeed happened with Christianity in the post-1900 era.