Why is there a young widow clause that takes away SSI benefits from a mom when her child reaches 16?

My husband died when our infant son was 4 months old and I got a small amount of social security to help supplement our income. When my son reached 16, I'm no longer a widow but can reapply at age 60 if still single? WHAAAAAAAT? In my husband had been in the military this wouldn't happen. The state didn't believe me and I went through a lot to explain this atrocity. Since when does a 16 year old not need a good parent? Most parents in offices that apply for funding are illegal and underage who get funds for that baby until the child is 18! HOW DO I HELP CHANGE THIS SOCIAL SECURITY LAW?