It doesn't seem to me that a single email should be sufficient to remove their liability for selling these things. They have sold thousands of glasses with the

It doesn't seem to me that a single email should be sufficient to remove their liability for selling these things. They have sold thousands of glasses with the description of being ISO certified and safe to use. They've been selling them for months. Then a week before the event they sent out an email telling you it wasn't safe to use them. What percent of their customers will never see that email and potentially ruin their vision?