because sometimes we are just feel a horrible need to do these things
like "I shouldn't eat chips, I'm on a diet"
"I shouldn't waste too much time, I have an exam tomorrow"
bas guess what
we do
"I knew the rules, I understood what I was supposed to do, but I didn't, I couldn't, I was compelled to stay. Compelled to disobey"
-Smith from the matrix
even he did what he shouldn't have done