Why we should not get married or get babies?

I can't decide if I should do my speech topic about marriage or babies.
It's most likely I am going to write about babies.

People should not get babies because
1. They are expensive (Imagine what you can buy with that sum of money!)
2. Earth can live better without our offsprings (sorry. But we are now 7 billion)
3. Statistics show that we live more happily when we don't have babies to take care (IDK I made this one up)
4. I need one. HELP