While I don’t agree with this law, it’s not dumb. Security is about defence in depth. A determined attacker might have a way around this law, but perhaps not every criminal would know about this method, or think to use it.

It’s easy to scoff at blunt-tool laws because you can think of a way to undermine them. But law and society are built on a patchwork of imperfect systems which can individually be broken, undermined, manipulated or worked around. In aggregate, they do achieve some semblance of a result, because they are layered together - even if each one alone provides only a marginal element of security.