We trust computers to fly jets... why not trust them with our petabytes?
The answer is obvious when you deal with the support staff of any major company (like Oracle in our case, but you could insert any major supplier here). Lots of problems and bugger-all done by "support" to actually fix them!
If that sort of company wrote avionics software (and were not regulated) jets would likely never get past the end of the runway without an incident! Nothing wrong with software in theory, just in practice its out-sourced to muppets to do for cheapness and speed (yes, right!) because they see the chance to fix it later at the customers' inconvenience, something you don't really get with hardware implementations.