Say wha?

Image source: http://www1.istockphoto.com/file_thumbview_approve/1217682/2/istockphoto_1217682_cartoon_explosion.jpg

I'm studying for the 430 mini-final, we have to know these "technological" disaster case studies. So what do we come to learn... um... things blow up because people did wha???

1) Try to replcace pipings while the process is up and running!
2) Hook up the switch in reverse position, on=off, off=on
3) No pressure relief valve on the reactor tank...
4) build houses on heavily chemical contaminanted land, and "donate" it to the educational board for a dollar
5) pay a railroad contractor to build a dam...
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the list of most stupid causes goes on, but "i couldn't help by wonder", are these really technological disaster? Have we been all blaming the wrong "guy"? Mr. Tech must be so sad. It's the people's own stupidity...

It's sad but extremely funny in a sick sick way. My face kept getting confused about the emotions on display...