How does the title of this article about the London riots connect to the substance of the article?"Look behind the crime to see its causes". ...

According to the link you've provided, the title of this
article is "Look behind the crime and violence to see their causes."  This title relates
to the substance of the article because the author is arguing that what is most
important is the conditions that lead to the rioting.  She is saying that the riots are
caused by certain conditions in the society and that the most important thing is to
understand what those conditions are.

In this article, the
author argues that the riots were caused by government neglect of the poor.  She says
that this is the factor which is most clearly to blame for the actions of the rioters. 
They have been, she implies, driven to commit these crimes by the
government.

The author's main point, then, is that the
causes of the riots are more important than the actual crimes and violence committed
during those riots.  This is clearly reflected in the title of the
article.