Wow...after everything there are still people mining Slush ?!?
This is called "an inertia".
It is rather a lot of people who mine know variance effects and know that after rain comes sunshine. No need to hurry.
Moreover it seems that the sun shines on the pool of slush now!
If people truly understood how the variance works, they'd know that past rain has no bearing whatsoever on future sunshine.
Maybe a better way to put it is that while it is raining, that is to be expected, because it will rain from time to time. But we can also expect sunshine, because there will be sunshine from time to time. Over a long enough period of time, we are likely to see that we've had the appropriate amount of rain and sunshine.