Marc B. Shapiro writes: While I have enormous admiration for R. Bleich’s erudition, not all of his conclusions are widely shared. For example, in a 9/11-type scenario R. Bleich argues that it is forbidden to shoot down an airplane which is going to crash into a building and the innocent passengers will die anyway. See “Sacrificing the Few to Save the Many,” Tradition 43:1 (2010), pp. 78-86. Without getting into the possible halakhic refutations of R. Bleich’s position, and why this case is not parallel to talmudic examples which speak of killing one innocent person to save many others, my approach in such matters is first to see if a conclusion leads to absurd results, and if it does, that would generally be a proof that it is not a tenable ruling. (This was exactly the approach followed by the Maccabees when they concluded, after many were killed, that not fighting on Shabbat, even in self-defense, cannot be what God wants. See 1 Maccabees 2: 29-41)
If terrorists hijack an airplane, place a nuclear bomb on it, and fly to New York City or Tel Aviv, can it possibly be the halakhah that the plane cannot be shot down, and instead we will have to watch the city with all of its millions be killed? If I put an innocent person in my car trunk, load the car with explosives, and start driving the car to the middle of the city to explode it and kill hundreds, can it be that according to halakhah the military can’t blow up the car since an innocent person will be killed? If so, then in a state run according to halakhah terrorists will have a major new weapon: simply bring an innocent person along with them and this will prevent lethal attacks against the terrorists. In fact, they already do this in places like Gaza, and would anyone suggest that the State of Israel can’t defend itself even if it knows that an innocent person will be killed? It is thus not surprising to me that R. David Lau, when asked about shooting down a hijacked airplane to prevent it being crashed into a building, replied that it would be permissible. See here. When dealing with a 9/11-type scenario, Dov Halbertal refers to the innocent passengers as רודפים מאונס, thus meaning that it is permitted to shoot down the place. See Erekh ha-Hayyim ba-Halakhah, vol. 2, p. 382. R. Yitzhak Zilberstein states that during war the various rules about killing innocents to save others don’t apply. See Tefilah u-Refuah (Bnei Brak, 2011), pp. 58ff. He also suggests that one who is being held by terrorists intent on killing him (which is obviously the case with a hijacked plane) has the status of a גברא קטילא. This leads to the following conclusion (pp. 59-60):
ולכן יתכן שאין בהריגתו חידוש מצב של מיתה
This is in line with R. Elyashiv’s opinion that if terrorists are holding an innocent hostage, and are intent on killing him, it is permitted to drop a bomb on the terrorists even if you know that the innocent person will be killed at the same time. R. Elyashiv sees the action of killing the terrorists as a מעשה הצלה for future innocents. This pesak was given to R. Yaakov Wiener, and as R. Wiener notes, and contrary to R. Bleich’s opinion, this means that one can also shoot down a hijacked airplane in a 9-11-type scenario, since by doing so you save those currently on the ground from the intended assault. See R. Wiener, “She’elot u-Teshuvot be-Hilkhot Pikuah Nefesh,” Yeshurun 13 (2003), p. 552.
