That's a fair point. To that I would say once you lift the curtains and take a peek, you will find many different school of thoughts within this. Some of the most famous personalities and ideas about PUAs in the mainstream isn't even very popular inside the PUA community.
On the other hand, there are entire "systems" that are premised on being dead honest about your intention.
Except for the moral aspect, which PUAs seem dead-set on ignoring.