> why the fuck is our critical infrastructure running on WINDOWS.

That hits the nail on the head.

But it is a rhetorical question. We know why, generally, software sacks, and specifically why Windows is the worst and is the most popular

Good software is developed by pointy headed needs (like us) and successful software is marketed to business executives are have serious pathologies

There are exceptions (I am struggling to think of one) where a serious piece of good software has survived being mass marketed, but the constraints (basically business and science) conflict