Over 80% of Americans go out of their way to do this, restoring my faith in humanity. What is it?

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Answer: Pay it forward

Clues: “re-do” and “Kindness”

A poll found 84% of Americans will go out of their way to “pay it forward” whenever they can.  The average person estimates they have five generous “random act of kindness” moments a week, or 260 a year.