Note that I am not agreeing or disagreeing with the merits of that outcome; I am just noting that the process you describe has already been done, and has determined in this case that "gambling is OK."
Why should we revisit that process simply because a few people dislike the result? By what right do you suppose your personal views ought to overturn this social process -- simply because you and a few others personally disapprove of the outcome?
Should social processes always yield results that you personally like, and be considered invalid when they don't?
So yes, I "and a few others" disapprove of this outcome and are acting to change it within the constraints that we have. You oppose that or not that's your business.
Then you said "there is no point at which the process is 'complete' for a given policy and must be merely accepted..." This sounds very much like you believe it is both possible and correct to revisit any policy topic at any time, and with no particular criteria for when it is valid to do so -- it is always valid to do so, under that statement.
Thus, I asked for clarification -- it sounds like there are no possible objective standards for the lawmaking process in your formulation above; any law or policy can be revisited at any time, and without any objective criteria that leaves purely emotional arguments and whoever successfully gathers a bigger band of followers to their side as the main determining factor in what policy we get.