These past few days there has been an escalation of violence in our land, exceeding (unfortunately) normal levels. As a result, those in charge of security at various Jewish institutions around the world are recommending increased preventative and general security measures.
These are important and necessary steps. While we should rely on God in all matters of life, this does not mean we should remain idle. God blesses us in everything we do, which implies that we must take action. It is forbidden to rely on God to perform miracles for us—that is, to take actions based on a divine miracle—so we must act within the possibilities that the nature of the world allows, and leave the rest in God's hands.
However, it is crucial to understand that the Jewish response to darkness is light. And Jewish light, so to speak, is the light of Torah and Mitzvot, as the verse says (Proverbs 6:23): “For the mitzvah is a lamp, and the Torah is a light.”.
The Jewish people are like one large body; there is a very deep spiritual connection between each Jewish. In addition to this, spiritual well-being brings about material improvement, so, in conclusion, if one wants to help the situation of our brothers in the Holy Land, one must increase in one's own spiritual well-being (which is, after all, the spiritual well-being of the entire Jewish people) so that this improvement is expressed in the material world, in security and general well-being for all the Jewish people, wherever they may be.
In other instances of war in the Land of Israel and in dangerous situations, the Lubavitcher Rebbe taught us that by increasing our observance of certain mitzvot, we increase, as mentioned, the safety of our brothers and sisters. Some examples are increasing our Torah study, prayer, and acts of Tzedakah (charity), in placing oneself Tefillin and place Mezuzot at the doors of the houses.
Each of these Mitzvot has a special content related to safety, so, as mentioned, the Jewish way of responding to evil is with good, each in their place and according to their ability.