I agree, it's "natural" for plants to kill each other. I'd say it's natural for humans to kill each other too. But we do also have the ability to recognize when it's more advantageous for us (and others on the planet) to not kill (or "hate"). These advantages are many, and may have led to our evolution past plant and lower-animal intellect & ability. Maybe there is higher life form(s) who sees all outcomes and always makes the best possible decision for everyone/thing? Maybe we can aspire to be more like that.