Some observations from recent events....
1. Don't place the response from AFL/Victorians as some part of a plot re expansion - they are genuinely shocked by the sight of two footballers going toe-to-toe, one knocked out, and nothing happening to either protagonist. Sure, there are plenty of cheap/violent shots in AFL, but these are (apparently) under the cover of "playing the game" and rarely lead to an ongoing barney - there isn't the "in plain sight" outright/protracted fist fighting to the head/body between two men that sometimes arises in RL. To the RL community, there are plenty of tackles more likely to injure a player than a fist fight.
2. We've had Aust rules in NSW/Qld since the 1880s - we all understand that code, and how it has a lower level open confrontation and body contact than in the rugby codes. The reverse isn't true. Most Victorians still really have no understanding of the rugby codes, other than they are violent when compared to Aust rules. In the Melb newspapers, until the Storm era, in the preceding 90 years the only RL stories were reports from NSW/Qld/NZ and England about (so called) on-field violent acts, brawls and crowd riots.
3. RL won't succeed at expanding beyond NSW/Qld in Aust if offers up the same on-field ethos as AFL. It needs to differentiate itself in the market, offer something different. The risk is that the NRL will respond to the misplaced media alarmists, and clamp down on all fighting. The 10m rule inadvertently got rid of a lot of intensity from RL, there's little opportunity to single out an opposition player in the run of the game. It's already ridiculous the extent to which players are penalised/punished for accidental head-high tackles that come from a tackler's arm bouncing off the ball, or when an attacker slips/stoops.
4. The influence of mothers on teenage boys is overstated (as any parent will confirm). As is the belief that mothers will be turned away from RL because of on-field fighting.
5. As for on-field acts leading to the public doing the same in the streets....well, let's ban boxing and V8s if that were true.