I was replacing a light switch, and in the junction box there is a romex that comes in where the hot was cut and shoved back in the back. The neutral from the same romex wire is connected to the other neutrals. In our attic there is 3 feet of blown in insulation so it's impossible to see where that line goes, but I was wondering if there would be any reason that this neutral being disconnected would cause any harm, any danger, or affect anything else? If the hot wire is not connected, I don't know why they would have the neutral still connected. (We just moved into this house and there are countless electrical jerry rigging done throughout.
Can I safely disconnect the neutral that matches with the disconnected hot wire?