that, however it may be mistaken, the end of law is not to abolish or restrain, but to preserve and enlarge freedom: - John Locke

In transgressing the law of nature, the offender declares himself to live by another rule than that of reason and common equity, which is that measure God has set to the actions of men for their mutual security; and so he becomes dangerous to mankind, the tie, which is to secure them from injury and violence, being slighted and broken by him : which being a trespass against the whole species, and the peace and safety of it, provided for by the law of nature; every man upon this score, by the right he hath to preserve mankind in general, may restrain, or, where it is necessary, destroy things noxious to them, and so may bring such evil on any one, who hath transgressed that law, as may make him repent the doing of it, and thereby deter him, and by his example others, from doing the like mischief. And

That which parents should take care of... is to distinguish between the wants of fancy, and those of nature.

This makes it Lawful for a Man to Kill a Thief, who has not in the least hurt him, nor declared any design upon his life, any farther then by the use of Force, so to get him in his Power, as to take away his Money, or what he pleases from him.: because using force, where he has no Right, to get me into his Power, let his pretense be what it will, I have no reason to purpose that he, who would take away my Liberty, would not when he had me in his Power, take away every thing else. And therefore it is Lawful for me to treat him, as one who has put himself into a State of War with me, I.e. kill him if I can; for to that hazard does he justly expose himself, whoever introduces a State of War, and is Aggressor in it.