Note the 3K explosion, "the most monumental non-nuclear explosion " ; below is a detailed link for it:
I am an automation engineer. I never consider being a web developer or a DB admin because I like controlling hardware to see something physically happens by your code.
Several years ago, some robots in our plant started working slowly. We found that it caused by a worm spreading over companies network, and consuming huge bandwidth. It took more than several hours to fix it.
Probably, hackers of future will involve in SCADA attacks more than deleting data or abusing web pages.
Someone get injured and even died in case of SCADA attacks, so I believe that securing SCADA is more critical than securing ordinary IT systems.
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