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That rather depends on the chances of live parts being exposed.I don't, but compared to not having one at all the chances of living are significantly higher, no?
Leaving installations with TT earthing aside, they would only die if something else is already wrong or they do something rather special like stick the fork in the toaster....
If the regs are met regarding basic and fault protection, and everything exposed and conductive is correctly held at earth potential, then a fault shouldn't result in a death.
(That's why RCDs are classed as "additional protection" in the regs)
Let's also remember that the vast majority of them are not used in accordance with manufacturers instructions, and the test button is never ever pressed. I've encountered a fair few older main-switch RCD consumer units where I turn it off and it won't turn on again due to a leakage fault that's been there all along but the RCD was stuck and didn't trip. In those situations it wouldn't have saved a life as it wasn't functional!
RCD's are certainly a good idea as an extra back-stop against the unknown, and early warning of leakage faults / faulty equipment. But according to my view of the world they aren't quite as transformative as can be made out sometimes.