Here is a splendid lecture, based on the American 5th Amendment, about why one should not talk to the police, if one is a suspect. If one is not, say a witness, or a victim of a crime, then the matter is entirely different of course. Although based on the American jurisdiction, Australia has the right to silence, so the same arguments made by the learned professor, also apply to us:
https://www.youtube.com/watch?v=d-7o9xYp7eE
Professor James Duane, Regent University Professor of Law, is brilliant and extremely persuasive. Simply view this, then store it away in your memory, and hopefully you will never need the information.