On Christianity.SE, we have a category of off-topic questions called 'Pastoral Advice'. We are very clear that we aren't priests - we don't know an individual's circumstance, and we don't try to "fix" people over the internet. In the same fashion, this is not and should not become a site for legal advice.
That said, we ask questions about theology - the general rule, or significant and common issues - all the time. That is the bread and butter of that site, in the same way that policy is the bread and butter of this one.
So, why bring up the example? Simple - Politics encompasses policy, but does not give legal advice. The same lines apply -
GOOD: Does Copyright Law in the US allow for fair use?
BAD: I've just copied a song on my YouTube Video. Is that fair use?
GOOD: Under what circumstances does Irish law allow for an abortion?
BAD: I'm 17, I live in Ireland, and my boyfriend knocked me up and left. Is it ok for me to get an abortion?
GOOD: Is it legal in [country] to coin my own currency?
BAD: I've just xeroxed my paycheck. Is that ok?
Notice, the line between 'legal' and 'law' in the above examples is slight but identifiable. Legal is personal advice. We are not lawyers (IANAL, and WE-ANAL) and we should not seek to be such. But, discussing the policy implications of a broad scope is relevant.
The line to me is simple - if you need to include personal details in order to phrase the question, its probably legal and off-topic. If you can ask it about a whole bunch of people, its policy, and fair game.