in 1982 the CIA was able to introduce software into a Russian pipe line that cause “the most monumental non-nuclear explosion and fire ever seen from space”. That was just introduce software. Imagine what could be done if you actually ‘hacked-in’ and controlled a system?
In 1982. In Siberia.
In other words, they brought down a system with ZERO security.
Our systems have sustained FULL-BORE attacks from Mexico and China. We have the logs; we know where the attacks came from.