The requirement to eat and get food is built into spacetime, did you know that? If space is the idea that something is "over here and not over there", then the thing over here lacks what is over there. This makes all of spacetime fundamentally lack based. Which means that everything that relies on it, which is all physical matter, every atom, is in some way lacking and deficient. Everything thus depends on something other than itself to attempt to become whole or sustained.
This lays the ground rules for what later becomes "feeding". Taking something outside of something to try to replenish what is lacking. And because of the ego's laws, if you take something from somewhere in order to address a lack, there is no increase, and only decrease, and now that thing is forced to lack "against its will". So if I take the apple from the tree the tree is now lacking an apple, and I have impoverished it.
If I take an animals body it no longer has its body. If I take water from the fountain it now lacks some water. Everywhere in this world this is true, with absolutely no regard for the form or type of object. And the act of "getting" from "others" is a murderous, attacking act, because it's an attempt to deprive them and to diminish what they have and to steal it away for your own selfish reasons. And so every single atom in spacetime is fundamentally, scientifically selfish.
The system of massive dependency later becomes what people call an ecosystem. An inter-dependent system where stuff consumes other stuff, selectively, and so it seems some things are "more ok" than other things. That's just part of the hierarchy of illusions. There are no special separate laws for animals versus plants versus microbes. It's all governed by the same ego laws of physics which are fundamentally selfish and murderous. This is why this is a cruel world that God did not create.
It's impossible to not be murderous if you do anything in this world physically. "The world of bodies is the world of sin." Best you can do is let Holy Spirit use the body and inform you of what to select, but this is not on a basis of being able to spiritualize or avoid the fact of what is happening here based on ego's laws. If you were truly operating under holy laws, God's laws, and no other, you would manifest food out of thin air, symbolizing the laws of increase of God, so that nothing is deprived or made to lack at your expense.
That is the ONLY way not to be murderous, by breaking the ego's laws entirely and bypassing them. This is why Jesus materialized food to feed people. You can justify and spiritualize a breakdown of objects into categories and give some special rules and other different rules if you want, suggesting some items are more sacred than others so you should avoid eating them, but that's a fragmenting and separation-based illusion of harmlessness, trying to be harmless to some parts of the world of death so as to justify why its okay to harm other parts. "The world was made that problems (like this) could not be escaped."
Only in God's Kingdom or under God's laws is there the possibility of true harmlessness.