That is fine but I don’t support DUI laws so I have no reason to support drug laws.
If I’m remembering correctly the significant majority of car accidents are not alcohol related and of the ones that are that majority is caused by the sober driver. The question is; if sober drivers might hurt others then shouldn’t we also support laws making driving while sober illegal?
Why is it any more a crime to harm someone while drunk or high than sober?
There is no reason to charge a person with crime for something they didn’t do or they might do, you charge them for what they did do.
If you follow the logic of the argument you shared then not only should virtually everything be illegal but it should also be illegal to not make virtually everything illegal.