So in your first post in this topic you deny there being any cruelty in nature, then you take an about face and admit that there's cruelty in nature.
Whether or not this cruelty is a 'nessesaty', as you put it, is irrelevant. Necessary cruelty is still cruelty.
Re the Camels - If you want to get pedantic, I used the word may, so it was a hypothetical statement and I never said the hypothetical camels were "perfectly healthy".
Also the 'untammed'(sic) animals aren't working together to create and regulate an ecosystem, they're out there to eat anything they can.