It would be politically risky, since no-one can predict the outcome with certainty.
Politicians' thinking on this subject probably goes something like this:
1. If decriminalisation happens with my support and benefits society, great: but...
2. If decriminalisation happens with my support and leads to a worsening of the present situation, my career will be finished.
3. If I don't support decriminalisation, I avoid the risk of failure and can gain points with my electorate for being tough on drugs.
So, the sensible course of action for politicians who want to maximise their chances of being re-elected (and who doesn't?) is to continue to oppose decriminalisation.
Politicians will only change their minds on this if there is strong public support for decriminalisation, with the tabloids getting behind the idea (did I just see a pig flying past?).


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