[randomsearch]

"yet, killing each other and eating each other is part of the cycle of life"

I'm not sure what "the cycle of life" is, but just because something may be present elsewhere in the animal kingdom does not mean we should replicate it or justify our actions through it.

[afarrell]

But does it mean we should be willing to lock someone else in a cage or ruin their livelihood for doing so?

[rimantas]

It does not mean we shouldn't too.