Regret

I was in the grocery store today, and the line was held up for a minute because the checker had to go get another checker who could speak Spanish.  I wasn't really paying attention to what was going on because I was trying to unload my stuff quickly and get home before the school bus.  When I finally did start noticing what was going on I realized the people- presumably a mom and daughter in front of me- were being told that the store could not accept their WIC check.  The check was issued from NY, and the store can only take checks from VA.  I glanced at the total on their order, it was only 24 dollars.  The woman told the checker she was not able to pay for the groceries without the WIC check, and asked her to put the things back.  Milk, orange juice, cheese and some dry beans.  I was about to tell the cashier to just add it to my stuff, but I hesitated. Was it too weird?  Would the woman be offended?  Was it stupid?  And in that moment of debate, the cashier cleared the items, and the people left.  They just walked out with no milk, and no food.  I really wish I had spoken up.