You do realize that Voynov was jailed for a couple of months, lost out on millions of dollars, and would have most likely been deported out of the United States, if he had stayed behind. That's a fairly significant price to pay for his actions. It's not like the Police and justice system just swept it under the rug, like they have with other pro athletes.
I think it just depends on whether one believes in people and their ability to change, and learn from their mistakes. Also, is it really beneficial to paint someone with one brush due to a big mistake they made in their early 20's, and hound them for the remainder of their life? The reasoning behind my stance, is that in my 20's I made mistakes myself. I drank too much, and even though I never did anything like Voynov did, but I probably hurt and disappointed loved ones. It came to the point where I decided to change, and did 12-step groups.
Not sure if you ever attended any of these types of meetings, but I have met people who became leaders of their respective communities, and dedicate their lives to helping others not make the same mistakes they did. I do not see how it is beneficial to paint a person who has done something bad (simple assault, theft, drug possession, etc), and paint them with a brush forever, and take their ability to make a living, people are generally less likely to have the resources to live up to their potential.
Obviously there are evil people out there, and some crimes legitimately do not warrant a second change (i.e. 1st degree murder, molesting children, etc). However, only a small fraction of people are legitimately bad people. Most, for a variety of reasons, can change. If I see someone make a legitimate effort to correct unacceptable behavior, and conquer their demons after they have paid their debt to society, why not give them a second chance?