I don't believe in the concept of second chances. 

To explain it simply, people I love the most, got a unlimited set of chances attached to my undying love.
No matter how badly they screw up, I'll always be there for them. And for me to turn my back on them they would have to completely cease to be themselves.

Bottom line is ... there're not many of them.

For the rest of the world I don't have expectations so generally they don't need a second chance because I don't care.

And if you're talking about crimes and such things I don't think individuals can judge what society hardly can.

EDIT : Plus, I'm always the one needing second chances ...