It's pretty clear to me that by "thought crime" he means "thinking about a crime...

stavros on July 22, 2013 | parent | context | favorite | on: Questions about Cameron’s ‘new’ porn-blocking

It's pretty clear to me that by "thought crime" he means "thinking about a crime without actually committing it (or even intending to)". Viewing a rape video doesn't mean you will rape, or even that you want to rape someone.