Philippians 2:21 For all seek their own, not the things which are Jesus Christ's.
Here is an article I wrote addressing the issue of the Duggars' view on birth control. In the economy of God, it does not matter what people think about these issues, no matter how spiritual and godly they present themselves and their position. What really matters is what the Bible says and whether their reasoning holds up to the test of biblical principles and teaching.
When someone, no matter how "wise" they appear, starts to promote various extreme ways to humble the flesh that are not clearly commanded to the church, it's time to step back and reconsider what they are doing. Frankly there is no clear scripture, especially for N.T. believers, that makes it "wicked" to use non-life-threatening forms of pregnancy prevention (known as birth control to the world).