Lance,
I agree that it is the society that sometimes forces us to accept something that we personally don't cherish at all. We have all been there, and as much as I personally try to avoid it, I found myself several times falling down to the mud of the rotten society rules... (later you can not wash the mud out easily.) 
We live
in the world, and therefore we are limited by what we can do pursuing our own dreams. Not everyone is free to do everything they want. What Ennis feared, kept him chained in his miserable life, and missing out on a wonderful life with Jack. Sometimes, facing these limitations, whether they be fears or lies, can open up new avenues to pursue our dreams. What matters is the courage to change, to try, to reach high, to dream the impossible dream. Not all of us can do that. Jack did. It's why we admire him so. Ennis, after the epiphany at the diner, tried reaching out to Jack in a postcard, a first perhaps, but had his dream shattered by a single red lettered word. It's why we ache for him so.
As for washing out the mud, Christians call it repentence, Buddhists call it repentence, Muslims call it submission or repentence (not too sure). Dr. Phil call it "you can
not keep doing the same thing and expect a different result." The saying goes, "It's never too late."
What I don't agree with you is that Lureen thought of Jack to be a lesser person for any reason. She hated other treated him that way (it was obvious in few scenes), but she was part of that society, which she couldn't avoid. She wasn't able to stand up for him, for she was a woman... I resent her a lack of feelings for him, but the same as Jack, she did her best in the circumstances of the society and her own capability of loving someone.
I have to confess that I do not have a good grasp of Loreen and her motivations. I don't know if her marriage fell apart because of her pursuit of finance or her pursuit was a means of solace from the failed marriage. Perhaps it's one of those self-fulfilling reinforcing contributing factors that made the failed marriage self-catalysed. I understand the society of her family made choices limited for her. The bullying old man Newsome also made life difficult. I don't know her feelings well enough to say if she still loved Jack after Randall et al. But she certainly embraced the high society (recall her Greek snobbishness with LaShawn) and exacerbated Jack's feeling of "left-out" loneliness.
The sad part of it all, it's that Ennis did
his best against the homophobia, while Loreen did
her best against the snobbishness, but in the end, it was Jack who was left hanging.
Also, Jack was a good husband and a father, but he would've dump both his wife and son for Ennis any moment Ennis agreed to be with him... unfortunately he never did. What I mean, that it wasn't LD or Lureen's fault of their poor marriage so much as it was his longing for Ennis which never found it's way to the "sweet life".
Finally, the red words are so true! My Jack! 
Yup. The fact that after twenty years of short leash yanking from Ennis and constant condescension from Texas, Jack only drank as much as he did and not more, says a lot about the man.