Why do you call them negative?

They are what they are.

We don't say the Lion or any hunting predator is Evil or Negative because it does what it does. Those are human inventions.

Those creatures are just acting according to their nature just as the Lion does.

Do you really understand those entities you are talking about?
What their function in the universe is?

Every time humans have interfered in Nature think they were conservationists they made it worse. Natural Balance is created by not interfering.

We are not here to save everyone. Some are just going to be food for the lions because everyone needs to be fed.

One of the few reasons I love this place:
Answers like this
Those who serve go up the ranks in the universe. Every creature that dies so another can live gets promoted so to speak. They slowly go up the evolutionary ladder.

If there were no challenges predators and obstacles what we are evolving would be too weak to handle the top end of town.

You don't get strong by having no resistance.

Have no worry for the humans who become food. They served and were of service. Nature gets the best of each kind by being Ruthless.

Humans have tried to escape the process, now the curve gets steeper because they are behind it and refused to do the hard work. Now they get crushed unless they can keep ahead of the wheel of time.

Those who put in the hard work over lifetimes have nothing to worry about. Their evolutionary work is ahead of the current challenges which they can overcome with their earned skills.