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How does it follow that an event with no cause has no explanation? We can explain the Casimir effect and radioactivity, and we can at least describe quantum uncertainty. I guess you could claim that any event resulting from quantum uncertainty has no cause, but arguing against that is that even though quantum uncertainty has yet to give up all it's secrets we still know a great deal about it. Entire libraries of books describing various facets of something is the opposite of the absence of an explanation, even if we still have a long way to go.
If there is no way to explain how something can happen without a cause, then it has no explanation. Therefore, a causeless event has no explanation. For if there were an explanation, it could be explained.