Wal-Mart is a store. They abide by all the laws set down for selling guns. They are not at fault.
Maybe the girl's family should be held at fault. Why weren't they monitoring her? If she was unstable, why didn't her family at least feign enough interest to ensure her well being?
Probably b/c it is much easier to blame Wal-Mart and they see a way to get some money.
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