Actually it makes perfect fucking sense to have more than two children. If you were so smart you'd know this.
Because not everyone is gonna have 2 kids.
Because not all kids are gonna grow up themselves to have 2 kids.
We also need population growth to maintain the economy.
So your a fucking idiot.
The birth replacement rate to simply maintain current population figures is 2.1 children per parent. It is an average. The native European populations(outside of Muslim Albania) are all in the 1.3 to 1.8 ranges, so their native populations are going to decrease. Scientific, technological, and medical advancements are making it possible where we do not need swarms of people to continue to grow the economy. Economic growth in some instances is not dependent upon population growth, but rather amplifying the wealth and abilities of the current existing population.
Increases in population also put tremendous pressure on the sustainability of our natural resources, which are mostly finite. Continuing economic growth through sheer population growth is a foolish and disastrous endeavor. Already, population growth is taking a hit simply due to things such as overgrazing, overfishing, deforestation, and pollution....and why did these things occur? Unchecked population growth.