Answer:
Society doesn't accept ex-convicts. Society look at them like if they don't fit in again. This people live marginalized the rest of their life unless they show they had change, but people doesn't give the opportunity they look for, so they need to create that opportunity and people doesn't want to see it. The sad side of the story is that society doesn't give another shot to these persons, but they take the opportunity to marginalize them, as it happens with Valjean with the yellow ticket. This is like the way people tell other people that they aren't accepted, and to keep them in distance.
