If her intent was to keep the status quo, then yes she did. I see it bandied about that she did this with the intent of breaking it away from ABC, but I very much doubt that is true.
(I'm not sure about wealth begetting liberalism: individuals make choices, and there are a lot of good, conservative, wealthy people in the world. I will admit that wealth can make life rather complex ;-)
Yes there are, and they probably have a common sense edge over their opposition. There are exceptional people in every society, and it is quite possible that some people are immune to the charms of social approval from their "peer" group, but I don't think most people are.
Also, I think the problem tends to affect those people who were raised in wealth but did not earn it themselves, or for people for whom it came far too easily.
I will point out that Murdock's sons are quite a bit more liberal than he, and for awhile there it looked like they were going to pull the plug on conservative people on Fox altogether.
And yes, Roseanne blundered. Badly it seems.