As much as it sucks when people are grouped with hackers. I think this stigma is a slippery slope and just leads to even more "Witch Hunting", How can you be 100% sure that these people are even aware of the person cheating. Even if the person is guaranteed to be knowingly doing this IMO a straight up ban seems unjust, its like the death penalty for someone for using drugs instead of committing mass murder. As stated perhaps a temp-ban system would work here.