Probably all the adds with sexy ladies wafting through grass fields.. it happens.. right?
haha but no, I think the idea of fruititarians is to continue that non ending of a life form by consumption. But reading it as 'non-harming' of all living things, can just get... out of hand.. and sometimes counterproductive.. yourself.. being a living thing.
But I guess..you're seeking for a premade answer. when seeking your own is more so ideal.
I mean.. in the case of not ending a life, you have to research it (for each edible thing)? and I don't know how grain fits in. And when you get to the end of it all being just and fine, isn't it just a comforting of inner uncertainties?
Might as well... do it your way
Sorry I am not much use; promise there is much to be found if you keep seeking along these lines in terms of clarity, but only ... clarity ... along these lines/context, which you seem to grasp with your own qualms.
But yeah, I don't know the philosophy of a fruitarians... I left school to write, so avoid reading.. novels.. poems.. lyrics... peoples work.. but found myself reading dictionaries and such like novels. sooooooOooo, my understanding of the word is probably just from a wiki.. bahah.