Why?!?

Everyone knows that cheating is bad... and still why are there people doing it ?!?
They say that it's there external memory ... when I heard this word I laughed to myself because they really name it ... and they don't care what other people say about them... They write their formulas in a small post it and put it in the cover of sci. calculator (Physics exam... ) They knew that they will have karma ... but still they do it ...

P.S. Really hate cheaters!! Hope that they change ...