We live in an imperfect world and bad people will always find a way to inflict harm on their victims, but this doesn't mean we throw in the towel. We fight.
I work in a small office and after three months of planning, it's starting to get stuffy around the office. And by stuffy I mean stressful. Rule #1: Don't waste time having imaginative arguments with coworkers in your head. Be the bigger person.