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 calmly by when his host is telling a roomful of people that the only way to deal with Southerners who oppose integration <WSD>is</WSD> to send in troops and shoot the bastards down . 
Meaning of the word marked with <WSD> tags:  be identical to; be someone or something