Everything is transitory and impermanent and nature needs a garbage collector.

I'd be surprised if people didn't have some sort of instinct to die under the right circumstances just like they have an instinct to procreate under the right circumstances.

In fact I'm positive of it because people kill themselves sometimes. What a strange phenomenon that is if you think about it. I've never understood it and can't imagine wanting to end my own life but apparently the tendency exists given the right set of circumstances.