I am 62 years old and have seen the harm that legal drugs like alcohol can cause and the tax revenue they produce for New Zealand without making much of a dent in consumption.
Personally, I have never experienced anybody behaving aggressively after using cannabis. It strikes me as a missed opportunity to not have a drug legally available that might not trigger violent behaviour, and that can be regulated, controlled and taxed to contribute to a more chill Aotearoa.