2nd Amendment

A well regulated militia, being necessary to the security of a free state, the right of the people to keep and bear arms, shall not be infringed.

Let us read parts of "COMMON SENSE" by Thomas Paine concerning the distinctions between human wants and government:

Of the Origin and Design of Government in General, with Concise Remarks on the English Constitution

SOME writers have so confounded society with government, as to leave little or no distinction between them; whereas they are not only different, but have different origins. Society is produced by our wants, and government by our wickedness; the former promotes our happiness POSITIVELY by uniting our affections, the latter NEGATIVELY by restraining our vices. The one encourages intercourse, the other creates distinctions. The first is a patron, the last a punisher.

Society in every state is a blessing, but Government, even in its best state, is but a necessary evil; in its worst state an intolerable one: for when we suffer, or are exposed to the same miseries BY A GOVERNMENT, which we might expect in a country WITHOUT GOVERNMENT, our calamity is heightened by reflecting that we furnish the means by which we suffer. Government, like dress, is the badge of lost innocence; the palaces of kings are built upon the ruins of the bowers of paradise. For were the impulses of conscience clear, uniform and irresistibly obeyed, man would need no other lawgiver; but that not being the case, he finds it necessary to surrender up a part of his property to furnish means for the protection of the rest; and this he is induced to do by the same prudence which in every other case advises him, out of two evils to choose the least. Wherefore, security being the true design and end of government, it unanswerably follows that whatever form thereof appears most likely to ensure it to us, with the least expense and greatest benefit, is preferable to all others.

In order to gain a clear and just idea of the design and end of government, let us suppose a small number of persons settled in some sequestered part of the earth, unconnected with the rest; they will then represent the first peopling of any country, or of the world. In this state of natural liberty, society will be their first thought. A thousand motives will excite them thereto; the strength of one man is so unequal to his wants, and his mind so unfitted for perpetual solitude, that he is soon obliged to seek assistance and relief of another, who in his turn requires the same. Four or five united would be able to raise a tolerable dwelling in the midst of a wilderness, but one man might labour out the common period of life without accomplishing any thing; when he had felled his timber he could not remove it, nor erect it after it was removed; hunger in the mean time would urge him to quit his work, and every different want would call him a different way. Disease, nay even misfortune, would be death; for, though neither might be mortal, yet either would disable him from living, and reduce him to a state in which he might rather be said to perish than to die.

Thus necessity, like a gravitating power, would soon form our newly arrived emigrants into society, the reciprocal blessings of which would supersede, and render the obligations of law and government unnecessary while they remained perfectly just to each other; but as nothing but Heaven is impregnable to vice, it will unavoidably happen that in proportion as they surmount the first difficulties of emigration, which bound them together in a common cause, they will begin to relax in their duty and attachment to each other: and this remissness will point out the necessity of establishing some form of government to supply the defect of moral virtue.

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Point being that human nature demands the existence of both state and a form of "private" militia or armies to balance out each other according to the stipulation of the 2nd Amendment of the U.S. Constitution.

Yes, there are both positives and negatives to the privitization of the military. It depends on the moral strength of the individual who would either control the private military or being president of a state controlled military.