Let's say the US banned strong encryption tomorrow. What's to stop someone in another country from posting the source code to a strong encryption scheme?
Maybe he realizes that this is part of how we got rid of "export grade" encryption in the US. Everyone was just writing software in a foreign country and people were importing it. Once you have the Internet, you can't realistically regulate software imports. Not if you're the US and the software is free. So export-grade encryption became simply a penalty for US businesses with little practical effect. At that point, you might as well accept it and change the laws to get rid of the business penalty.