Dropping 2k pound bombs is not a defensive weapon.
Israel is conducting a massive offensive campaign to try and eliminate Hamas.
Well, that's a matter of perspective. If that 2k bomb is being dropped on a bunker in which multiple rocket silos are shooting hundreds of rockets at you, I'd say that's a defensive move, no?
(And before you bring up Iron Dome, cops wearing bullet proof vests sitting in cars behind bullet proof glass are still allowed, even encouraged, to return fire, even if their gun is better than the one shooting at them. And that's considered self-defense.)