Capital YES.
Why won't i do good when goodness and mercy follows those that do good. Being hurt or cheated in the past doesn't mean you shouldn't be good because you never can tell who will repay you back in the future.
Although, sometimes in my life i have been cheated, treated badly despite the help i render to people most especially at work. The funniest part of this is that, the good i did to the person whom hurt me is the same good i did to the other person i got favor from.
I have always learnt from the adage that says "If you don't forget the previous day conflict, you may not have anybody to play with today.
Always do good and goodness and mercy shall follow you .