OK. To be clear, we – petrushkagoogol, sanctus, Einstein and I – agree that astrology is bunk.
It’s easy to promote an idea you don’t believe in – that is, to play the devil's advocate. Any moderately intelligent person can do it.
More important, I think, is having a clear understanding the purpose of playing the DA, of when and where it’s right to do so.
These are easily answered questions, I think. The purpose of the DA is to explore an idea – one you support, or hope to support – well, and to discover flaws and weaknesses in it. The right place and time to play it is where and when everyone is aware you’re doing so. A good way to assure this happens is to preface what you say or write with “playing the devil’s advocate”.
The danger with not being clear when playing the DA is that, rather than promoting an idea you support, you may support a nearly opposite idea.
So, to be clear, not playing the devil’s advocate astrology is bunk.
The Devil is in the detail...