Where to start...
Why not "Secondly, business and employment contracts are not a government, they are voluntarily agreed contracts. You can choose whom you work for, but you are born to the sect of government you live with. You have to work, yes, but that's a prerequisite to survival for any individual."

In ancient times, "work" meant walking into the jungle, building a house, and collecting nearby fruit. If you really wanted to go the extra mile, you planted a few fruit trees. Today, unlike every other species on earth, you cannot simply walk to an area and start working (farming and housebuilding). Because someone else has "left" that land to their kids in their will. All land is owned. Because that choice is today unavailable, you are mostly limited to selling your work to someone else, and they take 50% and give you 50% - if you are lucky. This is the way things are. True, the very smart can live without "an employer", but that if that were easy, then everyone would be doing it. Every way in which people attempt to leave the corporate system is nailed down, one by one. Try driving your own taxi, for example, (forget Uber - they want their cut also). Try cooking food and selling it on the sidewalk. You will be cited and charged and thrown in prison faster than you can say "freedom". Try finding a nice spot in the desert and drilling an oil well. Sure, there is a PRETENSE of consensual contracting, but the reality is that people HAVE to work to eat, and that means that they have to take what they are given. Thats a reality of life, not an ideal on paper, or a campaign slogan for capitalism.

You are of course free to CONTRACT with any other government you choose. I have done so many times in my life, and have lived and worked, legally, in three countries. So just like the supposed freedom to contract for the work and pay that you choose, you theoretically have the supposed freedom to contract with any government you like.
If course, we come to the same tweedle-dum tweedle-dee problem we have with corporations - You can pick any you like, but they are all essentially the same. So again, you have a pretend freedom which ends up as no real choice in reality.
Power is power, whether it is expressed by corporations, governments, religion or any other structure. And the point of power is to take away your freedoms so that those with the power can now work less by parasiting off your labors.
The only way you can exit the system is to hide in the woods and hope they dont find you, or to downsize your life so they dont care about you, or to join the greasy pole and become one of them.