Predicting that an outcome will be uncertain may be a valid model but is hardly useful since the causality is random.

I predict that you will spout blather but I cannot be certain what you will spout. It may be a function of how many empty open cans of Bud Light are lying on your floor.

Would you advance medicine by promoting a vaccine whose effect is random, ranging from harmless to killing the recipient? Hardly scientific.

My, you are a tedious fool. I predict that you will spout blather but I cannot be certain what you will spout.