Why do people have a hard time debating controversial issues using intellect and opinion supported by facts?

Whether you debate one way or another on issues such as 9/11 conspiracy, Iraq war, foreign policy, New World Order.... you can't seem to debate with anyone without them getting all defensive and resorting to name-calling and other forms of degradation. Can't people argue their point of view using facts... show more Whether you debate one way or another on issues such as 9/11 conspiracy, Iraq war, foreign policy, New World Order.... you can't seem to debate with anyone without them getting all defensive and resorting to name-calling and other forms of degradation.

Can't people argue their point of view using facts that support their opinion rather than speaking with emotion out their arrrrse? No matter what topic?
Update: Thanks for being my first example BENEDICT. haha...that didn't take long.
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