Owning and using arms are very different. The ownership typically has an avenue available in all parts of the US. If the avenue isn't broad enough or too restrictive then the courts re-broaden it on 2nd amendment grounds. Using is much more tightly restricted and illegal in most areas of the US, there is no area of the US where you can shoot mortars off of somebody else's building, at someone else's property, without consequence from the state itself.

But the primary difference between areas within the US borders and areas within Israel's borders is how the consequence materializes.

In the US the expected response would be an investigation, finding the munitions, taking the munition as evidence, finding the owner or user, interviewing people, indicting and convicting the owner, seizing the owners assets or finding the building somehow culpable too, only for the purpose of temporary ownership by the state, not destruction. If something occurred during the investigation or the presence of a law enforcement, the law enforcement may shoot back on the spot.

In Israel, right now the expected response is lobbing a missile at the building and gaslighting everyone that questions that particular approach.