[berkes]

That government has the monopoly of violence against the company too. They can easily strongarm the company into harming me.

With private security companies, private jails, private utilities, the harm both can and will do, is practically the same. And with the boundaries of "private" and "government" becoming more opaque (like private tech companies deciding who is to be detained and who not; who is allowed to access their money; or do their jobs, etc) the difference is even more theoretic.

A government that has absolute power over a company/sector, can (and will, in my belief) use that power to make the company/sector do it's work. Making this company/sector just as dangerous as the company.

If I get mistreated at an airport (of a democratic country), and the agents doing the mistreating are civil-servants, they (or their chain of command) are democratically held accountable. But if they are employees of Acme-Security Inc, granted the right of violence by the democratic government, there's nothing I can do, no-one to appeal to. Both cases are something I, an individual, cannot do anything against. I am mistreated anyway.