I am a Pollyanna

Richard DawkinsのThe God Delusionを読んでいます。
Do we really need policing - whether by God or by each other - in order to stop us from behaving in a selfish and criminal manner?
この事を試す様な事件がモントリオールで発生しました。
Our competing predictions were put to the test at 8:00 A.M. on October 17, 1969, when the Montreal police went on strike.
...
Perhaps I, too, am a Pollyanna to believe that people would remain good when unobserved and unpoliced by God. On the other hand, the majority of the population of Montreal presumably believed in God. Why didn't the fear of God restrain them when earthly policemen were temporarily removed from the scene? Wasn't the Montreal strike a pretty good natural experiment to test the hypothesis that belief in God makes us good? Or did the cynic H. L. Mencken get it right when he tardy observed: 'People say we need religion when what they really mean is we need police.'
Obviously, not everybody in Montreal behaved badly as soon as the police were off the scene. It would be interesting to know whether there was any statistical tendency, however slight, for religious believers to loot and destroy less than unbelievers.
"Pollyanna" は大文字で始まっているので人名からきた言葉だと思いますが、辞書で意味を調べます。
・Oxford English Dictionary: An excessively cheerful or optimistic person.: what I am saying makes me sound like some aging Pollyanna who just wants to pretend that all is sweetness and light
・Collins Dictionary: an excessively or persistently optimistic person: I'm trying not to be too much of a Pollyanna about it all in case something goes horribly wrong and the tumor comes back.
非常に楽観的な人なのですね。"Pollyanna" の由来は何でしょう？
・Online Etymology Dictionary: "one who finds cause for gladness in the most difficult situations," 1921, a reference to Pollyanna Whittier, child heroine of U.S. novelist Eleanor Hodgman Porter's "Pollyanna" (1913) and "Pollyanna Grows Up" (1915), who was noted for keeping her chin up during disasters.