
Let's take, for example, IV drug use. No government would be "proud" of having IV drug users around, and it is universally regarded as an undesirable practice. However, evidence has demonstrated complete prohibition of IV drug use doesn't really work that well, and has the downstream effects of causing the social marginalization and isolation that leads to high -risk behavioral patterns in that population. Services that would actually help these drug users cannot function effectively, as their target population is essentially underground, scattered, and fragmented.
On the other hand, by legalizing drug use, as in Victoria, we give organisations the opportunities to gather and target this particular population, providing ready access to support programmes and services that not only minimise the harm of IV drug use, but also facilatate their entry into rehabilitation programmes.
This approach presupposes a particular interaction between LAW and MORALITY. It suggests that the legal acceptance of a particular behavior does not necessary correlate with a moral acceptance of that same behavior. The corollary of that is that our moral convictions does not necessarily need translate into a corresponding legal stance on the issue.

These are difficult issues, issues that have been around since the Church started getting involved in Roman politics. But they are also crucial issues worth reflecting on. I'll post more as I sort out my thoughts ;)