IT Sector stands for Information Technology Sector.
Worst case is Cyberterrorism.
If someone hacks computer that maitains Nuclear Plant, it can cause explosion.
You can imagine consequences of hacking Medical Systems, or Traffic Street Lights, or deficiences in Military Systems.
But there are also subtler issues. With not enough of programmers, there are no one to maitain and modify business. As world changes, software needs to be rewritten to reflect reality. So system won't collapse under it's own clumsiness.
Or hackers suggest with subliminal messages to eat more. Or to commit suicides.