Progress?

"So often common sense means prejudice and not being in the 21st century" - so the Labour member, approximately, just quoted on the 6pm BBC Radio 4 bulletin. She was talking about the objection made by former Conservative leader Iain Duncan-Smith to the possibility that IVP would be offered where there would be no father.
Any cursory look at this blog will indicate the importance attached by this writer to the Christian conception of the family.
I want to make three other points.
1. Common sense is a term we do not want to undermine. If what Duncan-Smith was saying is wrong, inaccurate or faulty, then attack it as such. If it truly is a prejudice, give the evidence. As a teacher, I see daily evidence, admittedly not quantifiable, of the importance of proper, balanced, two-partner, male and female parenting. My brain synthesises the data available and comes to a conclusion. That is the exercise of common sense. Call my sense faulty - I have no objection to that. But don't undermine the concept of common sense, that we humans are capable of making evidence-based judgements useful for daily living across a variety of life questions. Common sense thinking will always submit to data.
2. Almost contradictorially to the previous point, no human can, if we believe Scripture, claim to be an effective judge in any lifestyle issue. Sin affects all that we are: deeds, thoughts, words, intellect, political thinking.
3. What is so great about our century and its intellectual progress? Why do we assume we've made progress in everything? That's a foolish assumption. Each claim to progress needs to be tested.