A cheap radio hack disrupted Poland's railway system
The world is astoundingly safe that these sorts of thing don't happen all the time.  Anyone who could light a cigarette could start wildfires all over California and many other places during the summer.  Anyone who can buy a GPS jammer could disrupt one of the busiest airports in the world.  With all the misanthropes out there you'd think chaos would happen more often.  Glad it doesn't.