It has been well established that the Internet, for all its wonders, early on fell into the wrong hands and since then has tended to bring out the worst in people. Rage, for one thing, as Bill Henderson of Springs points out in his editor’s note for “Rotten Reviews Redux,” a new reissue of the Pushcart Press’s popular 1986 “literary companion.” Rage that when paired with the safety of anonymity leads to an explosion of dreck online the spray of which reaches even a Luddite like Mr. Henderson, who professes to own no computer.