And Yaakov was very afraid and he was distressed- afraid that he might be killed, and distressed that he might kill others.”
וַיִּירָ֧א יַעֲקֹ֪ב מְאֹ֖ד וַיֵּ֣צֶר ל֑וֹ – ויירא שמא יהרג, ויצר לו אם יהרוג הוא את אחרים
(Beraishis 32/8 and Rashi, according to Midrash Rabbah.)
The Torah tells us that when Yaakov went to meet his estranged brother Eisav, he was afraid that he might get killed by him or his men, but was also afraid that he might land up killing Eisav or his men.
When the Jewish people are attacked, we are commanded to fight the enemy with all our strength in order to defend ourselves, and if that involves killing them in the process, that is the sad and unavoidable cost of war.
However, we do not enjoy killing people- on the contrary, the thought terrifies us.
It does not stop us from defending ourselves in any way, but it does show that our preference is always peace, and we would much prefer to be able to achieve our objectives without having to kill.
As our beloved soldiers enter Gaza on foot, by air, and by sea, to stop the brutal and insane indiscriminate rocket fire at all parts of our land, and to destroy the terrorist tunnels and infrastructure being used to kill our people, we daven for their success, their safe return, but we do not sit eating popcorn while the enemy is dying- we are hurt and distressed by every person we have to kill, how much more so innocent young children who get in the way or are used as human shields by the barbaric Hamas overlords.
לשועתך קויתי ה