I think we watched different shows. The DS9 I saw did indeed contain some of these elements, but neither portrayed them as correct nor the only way, at least not on the whole, and certainly not moreso than the average live action adventure show, or even other Treks.
Must be some kind of mirror...
To my mind, the most important thing to remember regarding DS9 - which set it really, really far apart from the other shows - is just because a main character says something doesn't mean we're supposed to think it's right. So while TNG would have Picard stand up there and pontificate about why thing X was bad and make it very very clear what message we were supposed to draw, DS9 would present all sides of the issue, and make it very clear that it wasn't going to come down to a pat answer - that we were going to have to end each episode and think about what it really had to say. Thus Kira's religiosity, Odo's authoritarian nature, or Quark's capitalism aren't meant as stand ins for the writer's ideology - they just stand by themselves as reflections of the character, with the writers trying to do their own POV as much justice as possible, rather than strawmanning them.