It is a fact that, by living on this planet, every animal and every plant too, "disturbs" someone else. It is a matter of love and empathy to reduce this stress to the lowest possible grade.
Not to kill and not to eat flesh ( -> ask someone else to kill in my place) represent, in my humble opinion, the very entry level of empathy.
A further level could be considered to eat only organic food, to become a vegan maybe, to use car only when really needed and so on...