Well, either the event is marshalled by the police to help flow, or it isn't. If not, then it is an impromptu group ride regardless of charity fundraising activity, and the riders are to be expected to follow traffic rules. Were they truly targeted? If so then perhaps this is unfair police attention, but if the situation is repeated often enough, it is going to get noticed. That was my point in raising the situation close to where I live. As much as I love cycling, many residents are frustrated by the scofflaw attitude of some riders, and this has been brought to the attention of the authorities. Having a foot in both camps, I can see both sides of the debate quite clearly. Riders can take their chances, but should be prepared to pay their subscription to the county.....
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Get a bicycle. You will certainly not regret it, if you live.