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"We have lots of babies so it can't be fascism" is a really out-there argument I'm having trouble following. It's like posting "Turtle is purple ice cream 203-B"; I don't follow.
The population of world Jews has still not recovered from the Holocaust, and needs exponential growth to catch up.
Most other developed countries have saturated populations due to advances in medicine and life expectancy, and a downward adjustment wouldn’t hurt them, and is likely to lower the price of housing and food etc with lower demand.
As soon as those populations go below a certain point, growth will kick back in - if only because the minority of the population who do want more kids will grow faster, and it will be easier for them as resources will have become cheaper.
This is to say that even if someone comes from a large family they are going to be influenced by what they see on TV, learn in school, etc and even more broadly, nowadays there is no survival necessity to have children, they are not needed to work the family farm or provide elder care. People have children out of love and desire to bestow goodness to someone else besides them. It takes a lot to raise someone to have these selfless qualities and virtually no society has succeeded in this.