The legitimate purpose of law is to protect rights, or at least to benefit society. Eg, speed limits should be in place for safety. What makes people angry is when the law is used for plunder. When speed limit laws are used to raise revenue, ie, when tickets are issued not because people driving unsafely, but simply to extract money from them, people get upset. Governments who do this are acting more like mafia than protectors.
In this case the banning of online gambling has actually resulted in the Government receiving less revenue from tax because the online gambling sites have moved offshore. So I'm not sure in this case that the law has been used for plunder.
I think there was probably some significant lobbying efforts from casinos in the US that contributed to the 2006 federal ban. So someone has been a plundering for money, I just don't think it was the Gov in this case.
