To forget you keys is an err?
To break a rule is an err?
To cuss while arguing is an err?
To disrespect a weak is an err?
To attack a defenceless is an err?
Human being are different from animals because they have a "moral" to differentiate between right and wrong
But when this moral is overpowered by desire and power we humans err.
Hence thiefs, rapists, abusers, murders and all other poor misguided souls are just humans that err.