On the other hand, sometimes cutting the cable is at least as dangerous as causing the aircraft to crash, for instance https://en.wikipedia.org/wiki/1998_Cavale

On the other hand, sometimes cutting the cable is at least as dangerous as causing the aircraft to crash, for instance https://en.wikipedia.org/wiki/1998_Cavalese_cable_car_crash https://en.wikipedia.org/wiki/1998_Cavalese_cable_car_crash The only safe system is for aircraft to avoid wires.