Well depends what you mean by birth control... is it a way to prevent pregnancy or children?
Since birth is in the name i'd say the term is better suited for referring to anything preventing the birth of a children. But what the term refers to has no barring on what's happening.
It never meant people don't make a difference. Any reasonable women knows and feel the difference.
The fact it's less safe and has worse effects on your health is just another way we realize how serious an abortion is. It will never be inconsequential even if it was safe.
Please do not to trust anyone who says people disagree with this. They all have a political reason to lie.
What do you mean by population crisis?
In the world it's the other way around, the demographics are still booming.
You know what came before having better birth control and lower birth rates in most developed countries, medicine and lower death rate. In most of them now both are pretty close (most because there are exceptions like Japan).
I'm not really sure i see a problem with a slight decrease in population in a place where there is already a lot of people.