[SoftTalker]

A locked door is not going to stop someone entering your house if they really want to get in. Doesn't matter what lock.

[bombcar]

The key is if they're trying to get into your house or if they're just casing the neighborhood looking for appropriate targets.

It's the "only have to run faster than you" joke.

And since this lock is a joke, having one is a nice little advertisement.

[heynowheynow]

That's a chicken-little argument of false equivocation. There is often to always a level of security sufficient to make forced entry too costly.