…because it’s too stupid to be otherwise.
Ohio Fireworks law:
http://www.wbns.com/?sec=home&story=10tv/content/pool/200607/2035112995.html
Yup. You read that right. You can buy them, but not set them off.
Idjits.
And mind you, all the states around us prohibit the regular folks from setting the things off, too.