Unlocked remotely by a centralized committee? Why can’t you just unlock it yourself?
That may also be an option; however, some might argue that it’s irresponsible for a committee to mass distribute weapons to people who lack proper experience and training. There’s a risk that someone might mistakenly use it on a burglar with children around or during a pro-Palestinian protest or something similar.
Having a central system can help ensure that the weapon is only used in true emergencies when the entire neighborhood requires protection.