Fluster (v) early 15c. (implied in flostrynge), “bluster, agitate,” probably from a Scandinavian source (compare Icelandic flaustr “bustle,” flaustra “to bustle”), from Proto-Germanic *flaustra-, probably from PIE *pleud-, extended form of root *pleu- “to flow.” Originally “to excite,” especially with drink; sense of “to flurry, confuse” is from 1724. Related: Flustered; flustering; flustery. As a noun, 1710, from the verb.
“We do not believe any group of men adequate enough or wise enough to operate without scrutiny or without criticism. We know that the only way to avoid error is to detect it, that the only way to detect it is to be free to inquire. We know that in secrecy error undetected will flourish and subvert”. - J Robert Oppenheimer.