Not exactly. This is an example of a change that would positively benefit millions of people a little bit and likely negatively impact (tens of?) thousands of p

Not exactly. This is an example of a change that would positively benefit millions of people a little bit and likely negatively impact (tens of?) thousands of people greatly. The overall benefit would be positive, but the majority aren't impacted quite enough to be very vocal, whereas the minority is and would be extremely vocal. This is not the case with all potential policy changes. Some go the other way (e.g. introducing trade tariffs - large benefit to minority in manufacturers, small negative impact on majority of consumers). And some changes benefit or hurt the majority greatly (e.g. minimum wages help a lot of people quite a bit).