Burger, given that a company's SOPs state that, below MSA if you get an unexpected and unexplained hard GPWS warning you go around, do you still maintain that it can be ignored?
On the next approach, as Sick Squid says, you are all at a higher level of awareness, you have discussed and checked out all possible contributing factors, and eliminated them, if it triggers again it is probably spurious and you can (by agreement in the interim briefing) ignore it.
All the above course of action is what I would have described as using common sense. Deciding on the spur of the moment without evaluating anything except the view, without consulting with the other crew member(s), without checking your instruments' integrity and continued functioning, ignoring SOPs and the Ops Manual is NOT what I would call common sense.