[grey_whiskers]

A number of quantum events are uncaused. Radioactive decay of the nucleus is uncaused.

Absolutely uncaused, or "according to the standard model, it's uncaused" or "it may end up having a cause someday, but we sure don't know now!"

Full Disclosure: I thought certain types of nuclear decay were caused by a 1s electron impinging on the nucleus?

Cheers!

[js1138]

Don't know about your "certain type."
But for those quantum events considered truly random, a local cause would contradict experimental evidence. The notion of causality derives from common experience and from experimental observation. The apparent lack of causation in certain quantum events derives from theory and from carefully controlled experiments. What the ultimate TRUTH is, no one knows, but it is incorrect to assert that everything has a cause. The evidence currently favors the opposite.