Not to defend nor condemn the piranhas placement on the list, but the piranha has at least nipped a man or two in its day- even though the scenarios of the "attacks" are overhyped and exaggerated- as rare and unlikely as it is, something still at some point has happened between piranha and man, even if it was in fear or defense. on the other hand, the deep sea fish definatly look fearsome, but those "diabolical, evil" fish, have probably not even broke skin on a person - granted, it may be due to the fact that theyve never encountered one-
I think the list wont be found in any encyclopedias, but it was a fun thing to read