You know why every single creature on this plant wants to live ?
The answer is simple
living beings with no will to stay alive simply die and go extinct
To not die and go extinct everyone needs a reason to stay alive or a reason to avoid death and survive.
No fear: This is the most basic and powerful emotion of every living being even humans. Without it Everyone dies. Every single decision we make influence our entire lives permanently in a chain effect and they can't be changed, fear and anxiety gives us a reason to make the most reasonable choice, if they manage to survive without fear, they might as well all be retarded, even plants and bacteria need fear of death to stay alive.
No courage: Everyone dies in stupid ways, and everyone becomes a coward with no pride, Why should I eat that plant? It could kill me in an incredibly painful way... better starve to death, Why should I defend myself from this big cat with point teeth? Resistance could be more painful than just letting myself being eaten alive.
No Love: Some people will not have will to live and reproduce or do anything. Some people won't be affected by it too much...
No empathy: killing and torturing random people at any time would be considered moral, though this doesn't make much of a difference, religions already have this same effect of moral destroyers.
No happiness: Not being able to feel pleasure gives us no reason to do anything at all, I want to kiss someone, but why should I do that if it makes me feel nothing? I want to find food and eat so I can survive another day, but why? I want to have kids so I can build a family, but why? I want to keep breathing so I can stay alive, but why? If there's NO emotional reward, there's no reason to do anything at all.
No sadness: Not being able to be sad makes you not care of anyone and lose your ability to feel empathy, love. Why should I not destroy your dreams or kill your family for my own interests if it doesn't damage you at all? I won't care cause neither me nor you will be sad about it?
No emotions altogether: With not any ability to feel anything from the above, we wouldn't be classified as living beings... we would be objects and our lives as meaningless as rocks.
You see ? We need emotions to make decisions, we need to make decisions to be human and we can't even exist without being able to feel any emotion at all...