Lightening strikes

Hello again. Lightening struck my brain, and no it did not hurt. I have a theme for my second book. I originally wanted to write on the disappearing tiger that people believe will become extinct someday from obsessive hunting them. I decided make the fierce tiger into fierce mermaids going extinct. Everybody knows they don't exist, but at one time people believed they did. I had a close relationship with a king and a wizard like King Arthur fighting the extinction of the river mermaids, but did not desire to write a prequel to explain how they met. Therefore I wrote the prequel first. So now the theme for book 2 is that extinction is not inevitable, not destiny or fate that we disappear into oblivion. Now the answer as to why that I had trouble figuring out. Why is extinction not inevitable? Because there is more than one way to solve a problem. There is my theme. Post later. Bye!