It is sometimes hard to separate honest objections to new developments in any community from objections based on the expectation that some locally (or nationally, or universally) unpopular ethnic group will occupy the development.
I don’t know enough about Ramapo/Monsey to determine whether there is merit to the objections of some developments. And as populations continue to grow, there will always be pressure everywhere to make room for all growing groups, whether frum Jews, Mexican immigrants, or left-handed one-legged soccer players.