Sentence:  In fact it has caused us to give serious thought to moving our residence south , because it is not easy for the most objective Southerner to sit <WSD>calmly</WSD> by when his host is telling a roomful of people that the only way to deal with Southerners who oppose integration is to send in troops and shoot the bastards down . 
Meaning of the word marked with <WSD> tags:  with self-possession (especially in times of stress)