so if all of Rockland county is vaccinated, at 97% effectiveness, with a population of 311,000 at 3% equals 9330, and we only have 186 confirmed cases.
""Rockland county is currently dealing with 186 confirmed measles cases. New York City has had 329 cases since October. In just the last two weeks, Westchester has confirmed ten cases."""
Looks to me that we are doing wonderful, why all the noise?
Lack of immunity + exposure = measles (at least in 90% of cases)
Most people get immunity from the vaccine. However for people for whom that isn't possible (either because they are young, sick or from the 3% you referenced) the only way to protect them is by making sure they don't come in contact with the measles. If only 3% can potentially get measles, the chances of them being exposed to one of those who have it is very small, and the disease doesn't spread.
Disclosure: I had measles in the 70's, my whole class did, 1 of my classmates passed away a few years ago due to a heart attack
Your anecdotal evidence, with a sample size of 20, tells us a lot less than the millions of people that scientists have studied.
But you know all of this...