Corporations cannot exist without government. Of course there can be a revolution which replaces the government with an existing organization such as a corporation. But then that corporation becomes the government. It will need to be funded too. Currently corporations which are larger than many governments are funded only by voluntary participants, if you don't include government subsidies. So it is not difficult to imagine governments too being supported strictly by voluntary payments from 'customers'.
I never said that it couldn't live without government. Notice the end of my first paragraph - I know that. "Corporate governing entity". And of course they need to be funded - but operating on soil you own and govern is, without a doubt, going to be a LOT cheaper than operating withing US regulations. And then they can provide a police force that keeps the peace and furthers their agenda and interests. And subcontract a medical company to take care of the wounded - which of course will be at a slim cost since they can always merge with a medical company for the purpose. And saying 'corporations which are larger than many governments' isn't hard considering that most African countries have a small GDP. And hell - for comparison, my CITY has more budget than Vatican City (which IS a country) by an order of magnitude. Now - if you can get me numbers on how many companies are larger than a DEVELOPED, PRODUCTIVE country, I'll agree with it. Because as far as I know, only the top 11 companies in the world have a revenue that can challenge the GDP of the developed countries with the lowest GDP - and four of them are 'western' oil companies, one of them is a Saudi oil company, three of them are owned by China. Then there's the Samsung Group. The only two companies which I could see could fit is Vitol, which manufactures commodities (and I don't have much info on it) and Toyota (which I can see fitting into the 'voluntary payments' part as they ARE stellar cars). And ignoring the government subsidies doesn't do much to help.