"single parent households" are precisely why these levers are important: among other things, they help reduce the disadvantages some kids have due to being raised by an impoverished single parent, and gives those kids a leg up in a way which will foster more stable home life and less likelihood of themselves becoming single parents.
Not only that, but more resources and more stability help foster successful relationships. If you want more two-parent households, make it a lot easier to have and care for a child.
