Dirty Dealings

For some people,

1. Playing dirty can help with forgiveness. Because since they also did something sneaky to the 'opponent', there is wrong on their behalf to absorb the anger caused by what the 'opponent' did to them.
example: in a school yard fight

2. Being less hygienic when younger can improve health on the way to maturity, and during maturity. Because the immune system would have had more chances to familiarize itself with germs in acceptable doses.
example: fully gripping and turning off the public toilet taps after washing hands