In Dan Ariely's book, "predictably irrational", there's a chapter about how everyone cheats a little.
And based on everyone I've met, and on Dan Ariely's own actions (1), I've concluded this one is true.
We all cheat a little from time to time.
Ex : for me, driving a few km/h above the speed limit is "cheating a little"
1 : https://www.businessinsider.com/dan-ariely-duke-fraud-invest...