This kind of statement feels very akin to the variety of Twitter post that's along the lines of "but who among us would be safe from prosecution if our DMs/private phonecalls/conversations with our secretaries were sent to the police, amirite guys?"
Anyone who believes that the only thing keeping themselves from murdering people indiscriminately is the law is a dangerous person. Anyone who believes that the only thing keeping everyone else from murdering people indiscriminately—but they themselves are, of course, the exception—is dangerous in a very different way.
The vast majority of people only ever feel like they want to seriously harm someone when they themselves have been seriously harmed, particularly when the system then protects the people who harmed them. We have developed a sense of morality that is often similar to, but distinct from, the law, that tells us that such things are wrong. And the vast majority of people want to both be, and be seen as, good people.
Anyone who believes that the only thing keeping themselves from murdering people indiscriminately is the law is a dangerous person. Anyone who believes that the only thing keeping everyone else from murdering people indiscriminately—but they themselves are, of course, the exception—is dangerous in a very different way.
The vast majority of people only ever feel like they want to seriously harm someone when they themselves have been seriously harmed, particularly when the system then protects the people who harmed them. We have developed a sense of morality that is often similar to, but distinct from, the law, that tells us that such things are wrong. And the vast majority of people want to both be, and be seen as, good people.