The dissemination of hate is one source that could be addressed.

Any Imam convicted of being linked to a terrorist act and the radicalization of the terrorist(s) involved should face life in prison in solitary with no chance of parole. 

Imams found to be preaching radical islamist teachings should be charged under anti-terrorsm laws and be imprisoned for the maximum term allowed by law with no chance of parole.

Social media companies, internet providers and all web search engines must immediately cease any and all transmission of radical islamist propaganda. 

The NSA and other security agencies around the world should be given the power to immediately hack and shut down radical islamist sites. The tracking of individuals and groups viewing these sites must be enhanced and then acted upon by law enforcement agencies.

Average, law abiding Muslims must take up this fight against the radicals - reporting them to authorities and working to reform Islam for the 21st century.