From the Smart Answers advice column:Q: One of the employees in my fabrication business uses the office computers to cruise the Internet and post comments at political forums. He is a very left-wing loudmouth, hates our President, and rants about the war in Iraq as "genocide for oil." Some of his opinions get his fellow workers so angry I have to step in to keep the peace. He is about 24 years old, has a degree, and is smart. My question: If I have to, can I fire him? I can't say it's a routine layoff because I'm hiring other...