The tax credits exist for married couples to promote stable families and marriages.
It's welfare. You like welfare. You think you have a right to more of my labor than I have a right to your labor? You think you're special? I need to labor harder and longer for you than you for me? My parents rasied 5 kids and never took government welfare nor did they need for a nanny-govenment to socially engineer them.
I'll ask again: You think you have a right to more of my labor than I have a right to your labor?