Husband keeps listening to his mom about carrying his social security card everywhere

First off please do not get political because I know what these comments will turn into and I know people will completely forget that point of my question so if you're gonna get political or racist just take that to reddit or Twitter.

My husband is Salvadorian. His grandparents on both sides are Salvadorian. Both my husband's parents were born in America and my husband was born in America. My MIL wants my husband to carry around his social security card at all times and he's listening to her instead of me even though I tell him it's a bad idea.

When my husband was 18 he was wrongfully deported to el Salvador. He was staying with a friend at the time who was not legal and the friend didn't even know. Someone called ICE on that family and my husband was struggling to get in contact with his mom. They made it hard to. By the time my MIL was able to find his birth certificate because he left all his important documents at his mom's when he moved out because he thought he would lose them but they got damaged when her home flooded, he had been deported to el Salvador. A place he had never been. And it was hell for his mom to get in contact with him so she could locate him and bring him back.

I understand why my MIL is scared. Especially now but I think it's a bad idea to have his social security card on him. But he's listening to her not me when because he wants to "calm her nerves". What happens if his identity gets stolen? He seems to care more about calming his mom's nerves than the consequences of that