Donald Trump is another example of many before him who have exploited fear to gain power and fame. He is knowingly divisive and thus harmful in our society, and his call for war against Islam is widely and justifiably denounced by those who correctly view his hate-filled diatribes as effectively fueling of ISIS' claim that because there is a Western war against Islam it must be countered with militant jihad. Fear, the ultimate goal of terrorism, is amplified by Mr. Trump's words. Those words are interpreted by some as encouragement to attack Islam and Muslims here at home. But the more that happens, the more attacks on mosques and Muslims, the more ISIS and its followers are pleased.