How are you supposed to eat ribbon candy?
The ribbon candy that I've had (and made) is an inch wide but only maybe 1/4 inch thick. It is very easy to break off just half a bend that fits in the mouth. There might be some errant shards but not full-scale shattering.

The appeal of ribbon candy over other hard candy is the appearance. Even when it is meant to be eaten it is made to be looked at first. I find it conceivable, if a bit unfortunate, that your ribbon candy was not intended to be consumed.

Another possibility is that it might be old. Hard candy can be still somewhat pliable when it is fresh. Depending on the climate, candy can dry and become more brittle over time.