That fear is that Purim and its Megilla (the Book of Esther) would inspire a wannabe to open fire on a group of innocents.
Mixed with the joy of Purim carnivals and costumes, the symbolism will not be ignored by Israelis.
We fasted for Yom Kippur, read from the Megillah for Purim, and said bruchas over every meal.
Jewish festival on the 14th of Adar (in commemoration of the defeat of Haman's plot), late 14c., from Hebrew purim, literally "lots" (plural of pur), identified with haggoral "the lot" (Esther iii:7, ix:24), perhaps from Akkadian puru "stone, urn," "which itself is prob. a loan word from Sumeric bur" [Klein].