Wrongful termination means that there is a specific law that expressly prohibits the employer from firing you for the reason he did. There is no law prohibiting the employer from firing you for a safety violation; therefore he can and it is not a wrongful term.
An employer can fire you without cause (though I do not agree that you were fired without cause) because there isn't any law that says he can't. No, it does not make any difference that you didn't know it was a violation; it's still not a wrongful term.
It may, however, mean that you are able to collect unemployment.