We have to remember the deeper truth, which we learn through believing the word of God, the Holy Bible. Our Lord and Savior showed us that the things the world seeks will fade away and die. We are taught to seek after the kingdom of God first, and the rest that we have need of will be added to us. God knows who believes in Him. Everyone dies. As Hebrews says, "it is appointed unto men once to die, but after this the judgment." And no amount of population rate increase or decrease will change that reality of our impending death. Politics is just a pipe dream, a distraction from the real pressing issues. First of all, this is to get right with our Creator, God, by believing on His only begotten Son, who was sent into the world to take away our sins, which is the thing that we really need.
Remember what the Bible says in Colossians, when it says, "If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God. Set your affection on things above, not on things on the earth. For ye are dead, and your life is hid with Christ in God. When Christ, who is our life, shall appear, then shall ye also appear with him in glory."
This means that the entire narrative that the world teaches, specifically the eugenic theory, that gene survival is the basis/end of all action is false. It's ingrained in everything of this world. This is the underlying narrative that our world believes in this age. It will be rebuked by our Lord in the coming age. This is currently the night before the dawn. Those who are asleep in Christ will rise again, just as Jesus Himself is arisen today. All those who deny Him will be sent in shame at that day to their final end.
With that in mind, I am concerned primarily with gaining souls to the cause of Christ. Each eternal life, which is put here with a purpose, is of so much more importance than what happens to us in the brief life we live here, which passes by in so short a time. We will be glad we spent time glorifying God if we did before He came, and that we believed His word (thanks to His grace) even during these doubting times.
It's true that the relative decline in behavior we see around us is due in part to the circumstances of the age, and also due to the malign influences of those who hate us. But that's the way the world has been, there is nothing truly new under the sun. There was never a golden age, that's a myth... and I think you know it. What we should focus on is serving the Lord in whatever role we were given. For those of us that are saved and born again believers, if that means sacrificing things of this world to gain a greater reward, based on our faith in God's justice, we shouldn't complain about it but be thankful when opportunities come. And yes, it may or may not involve having children. It just depends on what God has in store specifically for you.