One need only read the doctrine that is Islam. Koran, Sharia & Hadith. That is all you need to know, to understand the evil that penetrates that poisons the minds of these people. Why it makes them a threat.
Yes, and the sooner we Westerners come to understand that Islam has declared war against us, the sooner we MAY be able to save Western Civilization.
If we fail, and not IF, but WHEN, Islam overwhelms the West, the world will lapse into a period of wars, bloodshed, famine and misery unknown since the Middle Ages.
Islam is a cancer upon all decent peoples, and like cancer, it must be excised FRom society!