&gt; Why don&#x27;t we say that gunmen attack Planned Parenthoods because of income inequality in the United States?<p>I do.  I think the Planned Parenthood shooting is due to a combination of mental illness and lack of education.  I don&#x27;t think it really matters which crazy ideology you pick, you can use it to justify your actions.  And if the crazy, uneducated, people weren&#x27;t shooting up a Planned Parenthood, they would be shooting up a theater, or a school, or any number of other places.  The solution is to educate kids and to treat the mentally ill.<p>Why does this tiny group of Muslims commit hate crimes, while the vast majority do not?  Piketty thinks it&#x27;s income inequality, what&#x27;s your explanation?