I also feel some of these policies or ideologies promoting birth controls are often targeted at the proletariat in the society all because the bourgeoisie feels somehow threatened by the limiting factors that could come into play in the population.

This is so spot on.

In the end, this whole thing boils down to the paranoial mentality of the latter class of society to protect their wealth. They are more concerned about how an increase in world's populations would affect how much more they can acquire to satisfy their greed, instead of actually seeing the increasing rate as an opportunity for more resources to be stemmed up.