Unless you mean removing the feature from actual...
If nervegear existed would people use it to evil end like in SAO (Sword Art Online)
Even if you remove the kill feature it would only be for that specific game so if someone developed another game and gave it out it could still happen. Unless you mean removing the feature from actual Nervegear device but even if you do that there will be rival companies developing the same Nervegear device but just one of those companies have to be corrupt and this whole situation will happen. Even if you have patches the person who own the device would have to accept those patches and being trapped in the world is based of each game because the nervegear connects to the game and the database made for that game, the only way to stop this from happening would be to have one company develop the device and make sure that no other company could develop the Nervegear and have a generic database that every nervegear is connected to and that would have to be constantly upgraded and maintained which is why they had different databases for each game so they would not have to constantly upgrade and have it maintained 24 hours a day. I would like to thank Kastorian for a wonderful debate and may the best debater win!