I don't believe that Obama himself has an blunt understanding of this issue, but I can't know what is truly in his heart or head and the view promoted in his statements here is utterly oversimplified and purposely lacking in nuance. Glossing over the impossibility of providing security only against "bad guys" while leaving you open to "good guys" is an intentionally low resolution view of the issue intended to make refutations based on that impossibility sound like nerds nitpicking the implementation details.