Allow me to answer the question right away: We pray for both! Our daily t’filos are filled with requests for peace. In Shacharis alone, we mention the word “shalom” about 20 times. Yet, in those same morning prayers, we recite chapter 149 of T’hilim with the words, “To exact vengeance among the nations.” On certain days throughout the year, we say “Avinu Malkeinu,” which includes the request: “Our Father, our King, avenge before our eyes the spilled blood of Your servants.” On Shabbos, just prior to returning the Torah to the ark, we say; “May He (Hashem) before our eyes, exact retribution for the spilled blood of His servants, as is written in the Torah of Moshe, the man of G-d, ‘Oh nations, sing the praise of His people for He will avenge the blood of His servants and bring retribution upon His foes’… Why should the nations say, ‘Where is their G-d?’ Let there be known among the nations, before our eyes, revenge for Your servants’ spilled blood…”