Bad experiences can make us bitter or sweeter. We, normal human beings mostly have ample enough of bad experiences before we turn forty, some have lesser some have too many.
We will come across people who after spending a life with normal dose of bad things become bitter, angry, frustrated, crabbed up! On the other side we will come across people who have been through hell but have come out as a better, kinder person.
In the end I think a lot depends on us, our deepest self how much we will let the evil/bad influence us.
If we win we will become a better version of ourselves, if we lose evil wins!