“Stupidity is the same as evil if you judge by the results.”
Source: Surfacing
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Margaret Atwood 348
Canadian writer 1939Related quotes

“There is no such thing as an evil genius, as evil in it's self is stupidity.”
Source: The Wizard of Ooze

“You have attributed conditions to villainy that simply result from stupidity.”
Logic of Empire (p. 335); this is one of the earliest known variants of an idea which has become known as Hanlon's razor.
Short fiction, The Past Through Tomorrow (1967)
Source: The Green Hills of Earth

“I can't be frustrated at you because you’re stupid but I can be mad at you because you’re evil.”
The Rachel Maddow Show, MSNBC, March 2009 http://www.msnbc.msn.com/id/29676733/12

“It's a library, only the stupid or the evil are afraid of those”

As Quote Investigator explains, allegories about animals doing impossible things have been incredibly popular in the past century. But no, this one isn't from Einstein. (Source: http://quoteinvestigator.com/2013/04/06/fish-climb/.)
Misattributed
Variant: Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

“Why do you have to be the same as the others?… Most of them are stupid.”
Source: Winter of the World