Sure, but it's not a bad message. stable families promote social cohesion, and statistically are more likely to raise better behaved happier children who do better in life. You can see why they'd use the tax system to promote it, as it should result in lower social costs and a net saving.
Using the tax system to tell people how to live? I'd have thought with your anti-state, anti-government viewpoint you would abhor such actions.