[quote=@Wraithblade6]
If you're by yourself, are you really living? If you're the last person on earth, are you even alive?
[/quote]

Physically yes, but humans are social species. We like to pretend we could live without others, but being alone is what causes that thought. So once we are it starts to drive human mentality down the drain. This was shown on one of my favorite shows, last man on Earth. Which I am still behind on sadly.