I'm not so sure. The thing is, Rhys lived on Helios. Big space station, up in the sky. As far as I know, he never saw any of the destruction on Pandora firsthand? You hear about how Handsome Jack is civilising the borderlands and mining for eridium. It all sounds very clean and reasonable, right? And you hear about how he's clearing out the bandits, and that sounds fine too.

Then down on Pandora it's a little more obvious that the planet is being ravaged by earthquakes caused by the mining process. That Jack is shooting unarmed civilians, children included. That he's taking people and experimenting on them with slag to further Hyperion's weapons technology. And even if you learn the truth later, it's hard to grasp. Something that large and that different to your own knowledge of a situation - it doesn't sink in without considerable time and effort, you know?

Sorry, I'm rambling again. I'm just saying that I don't think Rhys would talk about it because it's not his story, I guess? I'm probably just making him sound like an uncaring jerk, but he's not.