That way of thinking is called Eugenics dates back a long ways. It was very popular with certain government in the 30’s and early 40’s.

There is no scientific evidence to support it though. People are on average getting smarter and murdering part of the population via birth control or other means does not have an impact. In fact, it hurts diversity which harms society in the long term. Don’t fall for the easy trains of thought that create Nazis.