Well...I'm not sure that the Bridge Farm troubles are ever portrayed as a consequence of their organic farming principles. Whereas Brian's loss of standing/slice of fortune/family home is presented as a consequence of his envelope-pushing, profit-seeking business practices. Maybe it's lazy writing though - there is something about how the Bridge Farm troubles keep arriving because they are somehow unworldly and unaware. They just don't seem to understand how their actions and words might appear, or what others' motives might be - Tom and Helen's latest blunders are good examples. (I am also getting heartily tired of Helen's self-punishing behaviour - I know masochism is a loaded word in this context, but it does seem to be what the writers wish for her.)
I thought the Olwen storyline was very good, and showed how hard it is to really take someone into your home and accept them as exactly equal to yourself and your own way of doing things. I think the confrontation between Pat and Olwen was very well handled - "I don't want 'better'". I think where Pat continues to come off as rather sanctimonious and unaware, though, is that instead of hearing her say to her family, "God, I really got that wrong, I thought I was doing such a good thing, but I can see how my life and values have changed and just placed me in a different world from Olwen now, and I was wrong to think I could bridge the divide.' Instead she was just embarrassed and wouldn't admit to how it had all ended. Maybe I missed something though, or the writers still have something in mind for the Pat/Olwen storyline.
And, no, I wouldn't take a homeless person or refugee family into my house, because I know I don't have the personal resources to make a success of it. (I have some minimal self-awareness that Pat does not, though!) Doesn't mean I don't have a right to be concerned about policy failures and nag my MP about it or contribute to charities working in the field.