The power and influence of culture

Many Christian parents won't send their kids to the public school because of concern over worldly influence.  Most of us watch over who our children associate with, in order to keep them safe.  We as adults choose our friends based on their character.   In all of these situations, the concern is over the power and influence of culture and worldview.
If these instances are legitimate (and I believe they are), then why do we not concern ourselves with our culture at large?
If you hadn't noticed, I have a big interest in things Russian.  I pulled up demographics on the nation of Georgia.  I found that 84% of that nation professes the Orthodox faith.  To me that is amazing.  I can hardly imagine what a national Orthodox culture looks like.  Obviously, I have to avoid the "grass is greener on the other side of the fence" mentality. But one has to wonder what it would be like to live in an Orthodox culture.
I have to ask the question, is it legitimate to move from a greater evil to a lesser evil, if at all possible?  Obviously, people are people wherever one lives.  Everyone struggles with sin, no matter what culture one lives in.  But should we do the most we can to live in the best environment we can?