Food safety issues related to eating raw frozen vegetables
While I agree that these types of warnings are conservative and partially CYA, I would suggest that they not be dismissed.

What needs to be understood is that there are other factors involved past the production method. Even if a mfr./producer observes and maintains the highest quality standards in their production facility, they have no control over how the food products are handled after leaving their facilities.

There are many transportation and storage steps between the time products leave a production facility and the time you pick it up from a grocer's shelf. If, in any one of these steps, the food has not been handled properly, the safety has been compromised.

While I would say that the risk may be minimal, it still exists. I am not overly conservative in my own kitchen, but one needs to know that the risk can be real. And just because something hasn't happened yet, it doesn't mean that it can't.