Why should single moms be treated differently in public policy?

What are they missing to deserve preferential treatment? All families types are equal to each other. Right?

Single mothers & their children should receive more support (European Union's Parliament)

I agree they deserve appropriate charity. Still it is not in my nature, but it is common to state in sympathy and need to mention if someone is a single parent. No one ever does out of their way to mention they're married parent. I don't think it would be charitable of anyone to state, "So what one parent, two parent, or three, no parent in a group home, all the same you know. It doesn't make a difference."