Let people crack uninstalled security devices with a SHI debugger. This would short out its inputs and outputs, clearing them and making the device usable.
In terms of not taking down every camera in the Mix, I think small world considerations keep you from doing that. There are cameras 'everywhere' so taking them down for the purpose of destroying them (and robbing whoever owns them of the ability to use them) would be a very small world thing to do. However, if you could re-use that camera, suddenly it's not so small world, because hey, there may be cameras everywhere, but there's a free camera -right there-.