Social conservatives can be boiled down to two issues:
Gay marriage
Abortion
That’s it. Nothing else.
Are other issues important to them (like school vouchers, displays of religion in school)? Yes, but they pale in comparison to the big two (and on issues like school vouchers, you’ll find a lot of economic conservatives support that issue also for non-religious reasons.)
The social conservatives are not the drag on the party (unless you think we can’t win without being pro-choice, in which case you might as well give up, because that is the one non-negotiable issue social conservatives have.)
Well, seeing as one would lead to a loss of freedoms and our society coming apart, and the other has killed 50 million innocent Americans, can you blame us?