That we may live, other life must inevitably die -- in fact, this is generally the rule for most life at this point. Even if you consider plants unworthy of the same regard we give animals (how zoochauvinist of you), animal life is lost in the tilling and harvesting from fields, even if pesticides are not used and no new habitat turned to our use. Further, the harvest would be most meager without any pest control, and manual removal of insects, etc. is fairly prohibitive; organic farmers usually make use of more natural options for pest control, like diatomaceous earth, rather than discarding treatment entirely.

The real lack of introspection is our handwaving away of this truth from notice, such that we find an unavoidable truth abhorrent.