1) I hope you aren't basing your policy positions on situations that involve completely hypothetical substances.
2) No I don't think we would need to ban it. Allow people who want to use it to lock themselves in a cell for 12 hours and rage against some padded walls. There probably would be a thriving market for that sort of thing [0]. We let people drink and if you drink and drive someone will probably die - the solution is not to let people drive after drinking. You're basically describing a strong form of alcohol. We already tolerate this sort of risk.
If you want to argue that a substance exists that is so terrible that people who consume it need to be locked up, you should name the substance and provide some argument for why it is so bad. The present state is locking people up for no obvious reason.
2) No I don't think we would need to ban it. Allow people who want to use it to lock themselves in a cell for 12 hours and rage against some padded walls. There probably would be a thriving market for that sort of thing [0]. We let people drink and if you drink and drive someone will probably die - the solution is not to let people drive after drinking. You're basically describing a strong form of alcohol. We already tolerate this sort of risk.
If you want to argue that a substance exists that is so terrible that people who consume it need to be locked up, you should name the substance and provide some argument for why it is so bad. The present state is locking people up for no obvious reason.
[0] https://thesmashroom.com.au/