You're basically saying "don't own something nice if you don't want it stolen".

More needs to be done to tackle bike theft. Be that education, physical deterrants (cameras, good quality bike lockup locations, etc).

I've had a bike stolen, and the police can do nothing. A bicycle is small, easy to disassemble, relatively low-value, and they are untraceable items.

A car is higher-value, but more easily traced than a bike - due to a large number of factors; size, colour, shape, insurance/legal documents to prove ownership, ANPR cameras, etc.