Self-defense is a countermeasure that defends your health and well-being from harm. To quote Marcus Tullius Cicero:

But what death can be unjust when inflicted on a secret plotter and robber?

What is the meaning of our retinues, what of our swords? Surely it would never be permitted to us to have them if we might never use them. This, therefore, is a law, O judges, not written, but born with us — which we have not learnt or received by tradition, or read, but which we have taken and sucked in and imbibed from nature herself; a law which we were not taught but to which we were made — which we were not trained in, but which is ingrained in us — namely, that if our life be in danger from plots, or from open violence, or from the weapons of robbers or enemies, every means of securing our safety is honourable.

For laws are silent when arms are raised, and do not expect themselves to be waited for, when he who waits will have to suffer an undeserved penalty before he can exact a merited punishment.

Let, then, this principle remembered by you in this trial, O judges; for I do not doubt that I shall make good my defence before you, if you only remember—what you cannot forget—that a plotter against one may be lawfully slain.

Judaism is a religion based on the teachings of the Hebrew Bible (consisting of the Torah - "Teaching", Nevi'im - "Prophets", and Ketuvim - "Writings"). Rabbinic Judaism also incorporates the teachings of the Talmud (consisting of a second "Oral Torah" that was not recorded in the original Torah and rabbinical interpretations of the "Oral Torah" and the Hebrew Bible). Jewish interpretations of the Hebrew Bible (and often the Talmud) culminated in the Halakha - "the way to go" in accordance with Jewish teachings.

Judaism revolves around covenants (or agreements, like a contract) with YHWH. According to Jews, YHWH is an omnipotent God that has a unique and preferential relationship with Jews. More specifically, Jews assert that YHWH entered into covenants with Jews where YHWH gives Jews blessings and property if Jews perform certain actions, like mutilating baby penises and sacrificing humans.

In short, the Jewish Torah is a book of Jewish witchcraft - a book where Jews enter into a contract with a supernatural being (YHWH) and receive blessings and property in exchange for committing horrific acts.

Among these horrific acts, YHWH seems to have a taste for sacrifices or "burnt offerings" - including human sacrifices. YHWH praised and blessed Abraham for offering his own son Isaac as a human sacrifice (Genesis 22), and YHWH offers to bless Jews if Jews murder prophets/dreamers/friends/spouses/children that "incite rebellion" against YHWH and if Jews mass-murder and burn entire cities of "infidels" as a burnt offering to YHWH (Deuteronomy 11-13).