Sadly, "plant food" has huge consequence to animals, and the mechanical destruction of insects is the least of it. Fields and plantations and orchards are chemical holocausts, pesticides and herbicides and fungicides wipe out most living things, some of them bioaccumulate and start attacking other parts of the food chain, others leech into ground water or rivers or oceans and quite often have horrible effects on aquatic life from amphibians to coral reefs. In some places and for some crops, larger pests might be culled (mice, rabbits, wild pigs, birds, fruit bats, deer, kangaroo, you name it). In food storage and processing is the same pest and fungacides with generally more emphasis on rodenticide chemicals which can also bioaccumulate and poison birds of prey, owls, snakes, etc. Then habitat destruction.
A person basically can't live in the modern world without destroying animals.
Although I do admire vegans who do it to try to make a difference there.