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High pressure prevents pinch flats but helps penetrative punctures occur instead as the tyre won't deform around sharp objects.
Tyre pressure should be optimised for comfort, grip, to avoid pinch flats and penetrative punctures, and this will vary with rider weight, load on bike, tyre size, rim width, tyre construction and if you are using inner tubes or not.
Anything with this number of variables is not scientific, it's a realm of voodoo ruled by Lord @edscoble
will read the last few pages where this seems to be discussed, but I had always been under the impression higher pressure = better protected
will wait for the pasela to die and take it from there I guess