With bankers using perceived credit risk to set their interest rates and amount of exposures; and regulators using the same perceived credit risk to set their capital requirements for banks; it is clear that perceived credit risks get a 200% weighting.
Any banking system that becomes 200% sensitive to perceived credit risks, dooms itself to lend dangerously much to The Safe, the Infallible Sovereigns and the AAArisktocracy; and way too little to The Risky, like to SMEs and entrepreneurs; which is of course fatal for the real economy and therefore also to the banks.
What would have happened if Winston Churchill, when confronted with the dangers had said: "In order to avoid our houses being bombed, we need to become 200% sensitive to risk."