I'm also interested in why some people seem to look for reasons to kill animals (and, all too often, each other)! I understand that animals can be a nuisance, as can people, but why can we tolerate some nuisances and not others?
My research is peripheral to my regular animal protection work, but important in understanding what we are up against.
Within the overreaching reality that we are a very diverse species with various people having all kinds of values, interests, experiences, intelligence, emotions, principles, ethics, backgrounds, needs, and so on, it seems that an overriding fact remains: in every successful relationship, the people involved worked at making it succeed. Those who have had successful marriages, business partnerships, teaching and learning experiences, family compatibility, meetings, get-togethers, neighborhood relationships, employee/employer relations, and so on all seem to agree that you have to work at making the relationships succeed.
With animals who often annoy people, we are, like it or not, in a relationship. It is somewhat one-sided; we are the ones who can adjust. The squirrels, raccoons, starlings, sparrows, pigeons, mice, bats, and skunks who are in our midst and share our world are not aware that their presence and activity can either please us or annoy us, or that the same activity can be irritating to one person while pleasing another. I once heard of a man who shot mockingbirds because their songs awoke him: an unthinkable attitude for me. I have had people call to ask me how to get rid of something-like frogs calling from a pond in the yard or swallows nesting in a car port-that would give me pleasure.