[Tainnor]

Quantum mechanics, at least, seems to indicate that certain things happen if not for "no reason" then at least not for any reason that we can discern in any sort of way.

But beyond that I think your comment misses the larger point: it's exceedingly rare for something to happen for "a reason", most things, even in a deterministic universe, happen due to the combination of multiple factors. Sometimes we can model the cause and effect in simple terms with some success, but in other situations (e.g. wheather forecasts) we deal with nonlinear and chaotic systems that we can't really predict very well.