The fine line between bravery and stupidity is understanding the risks. Somebody who understands the danger they're walking into is brave. Somebody who blissfully walks into danger without recognizing the danger is stupid.

A technological singularity is a theorized period during which the length of time you can make reasonable inferences about the future rapidly approaches zero. If there can be no reasonable inferences about the future, there can be no bravery. Anybody who isn't afraid during a technological singularity is just stupid.