Rabbi Avraham, son of the Rambam, writes in the Sefer Hamaspik Leovdei Hashem (Maamar Habitachon) about the trust a Jew must have in Hashem. He says that when the nations of the world are trying to kill Jews, our trust in Hashem must be accompanied by protective actions. In the times of King David, this would mean war; but in exile it means flattery and flight. We see that Rabbi Avraham forbids war even when the nations are trying to kill us.
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