Jewish tradition teaches: "Lo ta’amod al dam re’eikha" – "Do not stand idly by the blood of your neighbor" (Leviticus 19);
that every human life is unique and precious, created in the divine image; (Mishnah Sanhedrin 4:5)
and that it prohibits us from selling weapons to those who would threaten public safety; (Talmud Bavli Avodah Zarah 15b, Maimonides Mishneh Torah, Laws of Murder and Preserving Life 12:12)