The question of whether somebody could kill someone else without Hashem’s wanting it is a serious hashkafic question. In Hashem’s masterplan of the world, did Leiby have to get killed? Did Hitler have to kill 6,000,001 people? I don’t know. But I know from Chazal that Kayin didn’t HAVE to kill Hevel. As a matter of fact, because he did Kayin and Hevel and to be recreated many years later as Moshe Rabeinu and Ahahron HaKohen. To make up for the killing, Aharon HaKohein (Kayin) was a ohev shalom v’rodef shalom. So people can do things that Hashem does not want? That is the basis for BeChira. If there was no choice then there couldn’t be s’char viOnesh (reward and punishment).
Every person has his own way of getting through and trying to understand these tragic events that are befalling Am Yisroel. To some the answer is “we cannot ask questions”, to others the asnswer may be that “Hashem doesn’t kill, people kill”. We can each decide for ourselves how to get to tomorrow but lets remember ??? ?’ ???, for this is the only way to survive these horrific times.