No, they have Security Council veto votes. This has nothing to do with the UNSC. However, it would only be useful if nations like the US and China could be mad

No, they have Security Council veto votes. This has nothing to do with the UNSC. However, it would only be useful if nations like the US and China could be made to participate, so negotiating this would not be easy. At the end however, it would be beneficial for all participants. Now, why would it be a bad idea? Any argument, or "just because"?