> Because twenty years ago computer security was an absolute and utter shambles. Exploiting a vulnerability today is orders of magnitude harder than it was twenty years ago. Massive strides have been made.

Yes but once an exploit is found it can be tried on a whole lot more systems and the weakest link becomes a target. There is also a lot more interest hence brains in hacking/ransomware.

I lot of critical systems should simply be airgapped