And while I agree that Greenberg is a largely incompetent buffoon who is completely reactive to image over substance, there are a couple more things worth noting
1 - the public rarely has the whole story, while the NRL usually does. There has to be some level of belief that their decision making is based on the whole picture. What were the details of the offence, what were the circumstances, is it actually out of character, is the player likely to reoffend, what steps has the player taken.
Simply, they have more information than we do. Scott Bolton case is a good example - we have people here saying "why wasnt he life banned, he assaulted a woman". He was convicted of touching someone on the thigh. Lack of information and misinformation leads to dubious comparisons, this is why the NRL insist on a case by case basis for these things.
2 - Greenberg has showed some rare backbone in sticking to his guns, taking each case on its merits when most of the public is calling for blanket life bans. Bowing to public pressure would be taking the easy way out.