Good public relations and being legally correct don't really have much of a correlation other than by accident. I think it's more important for the press that we do what we think is right and that we explain why we're doing it, not that we got some <s>slimy</s> lawyer to sign off on things first.
For legal advice to be useful, the lawyer giving the advice would have to take responsibility for getting things wrong, and I'm sure it's hard to find someone willing to do that for very cheap. Outside of that, lawyers can point to the laws themselves and how they were interpreted by particular courts and not much else. This is something that anyone can do, though a good lawyer working in that field would likely point to a broader range of relevant information than a law student or other non-lawyer (or a lawyer who doesn't work in that field, who quite likely might not know any more than a non-lawyer who does work in that field).
In some cases the legal protections offered by relying on legal advice might be worth it. But, in general, managment usually has to make a lot of decisions on their own.
Anthony