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Family sizes are smaller for real world reasons as you say, but it comes down to being able to raise a family at a size you can support economically and emotionally. 1-3 children are manageable (for most) and anything bigger is hard to balance in today’s world.
I agree to a point. But some people think that to raise children (healthy ones), what is required is that each child have his or her own bedroom, an expensive college education, etc… Therefore, they use NFP (and contraception) to limit the size of their families. Both parents work, leaving children at home to get into trouble… (something that is otherwise known as “neglect” but is never treated as such…). People often rationalize having 2 incomes when both incomes are not required to live a decent life.
I think in all my long years as a Catholic (cradle Catholic… & I’m no Spring chicken), i have maybe heard One homily against contraception. I say maybe because i am not sure i EVER have… just vaguely seem to recall some priest mentioning it once a long time ago …

I come from a big family. We shared bedrooms. It taught us how to get along with each other… (etc). It taught us about love and friendship. I was not deprived in ANY way. I never desired “privacy” (a bedroom of my own) to speak of… We were, by most standards “poor” and yet i never felt poor… & to this day, don’t think we were… (by God’s standards…).
Poverty is subjective… But its pathetic how a lot of people these days say they can’t “afford” children, yet they have two incomes, a new car, etc…
The devil is behind contraception - even the unnecessary use (over-use) of NFP… The devil is behind a lot of other things going on in the Church also…
From the outside looking in, the Catholic Church, as practiced by most Catholics these days, doesn’t look much different from mainstream Protestantism… & Protestantism, for all its admitted good points, is still from the devil (via Martin Luther, who seemed, by way of his bizarre behavior, to have been demonically obsessed or even possessed)…
One time several years ago, I was sitting at the Blessed Sacrament and heard some disturbing words that seemed to come from “nowhere”… They said: “Get out of my church”…

:whacky: I didn’t understand it back then… but i think i do now…
Strange…