Not going to argue the DV and sports link. It's very well documented. And considering United has one of the biggest fanbases in the world, YES you are likely minimizing DV in the world if United does well.
I mean just consider this chat group. Would any of you be talking about Domestic Abuse if Greenwood was gone? Probably not. The fact that he's still here drives a conversation because of what happened. And I'm glad because I think awareness and perspective is what helps improve communities with complex issues like this.
I don't care about empty gestures like let's get rid of this person because they did something horrible. Might sound great in your heads, but running away doesn't solve any problems. Instead we should hold people accountable and make them learn from their mistakes. It's harder and makes everyone uncomfortable but I strongly believe it leads to better outcomes. There is no other way to hold him accountable since the courts acquitted him. So consider what you're proposing. Let him move somewhere else and hide away from what he did.
By no means is having him return mean that you are okay with what he's done. People only think 1 thing can be true at a time and that's just a limitation of how you choose to think and perceive the world. Hold him accountable, raise awareness for domestic violence, and stop sucking at football. Why not do all?