Proper habitat modification eliminates the need for continuous cleanup, which adds to the overall savings. Animal loving employees become disgruntled, which reduces productivity. Often, birds can travel significant distances before dying, thus spreading the danger. Poisons and their application techniques are generally indiscriminate. If protected species are injured or killed directly by ingesting poison or indirectly by eating poisoned prey, fines, imprisonment, or both are levied against convicted perpetrators.
Ignorance is no excuse in the eyes of the law.
Concern for animals is becoming predominant in our society. Lack of concern for animals' welfare translates into lack of concerns for those peoples' feelings. Studies by Harvard University and others have proven beyond a shadow of doubt that birds and other animals share feelings of pleasure and pain, along with many thought processes that formerly were attributed solely to humans. People who have and love pets concur. This makes extermination tantamount to murder.