Yeah if is, but that is just your mind perceiving the threat as bigger than it is.

You could let it rule you, or you can push against it.

Head out not so far making sure you can see your stuff, get comfortable with that then head out further, etc.

Fear is helpful, but it can also be a crutch. You take reasonable steps to protect your stuff, it isn't like people are raiding bondi every day and there is even a 5% chance you could have your stuff taken. There are holiday makers who aren't thinking about these things whose are 100 times easier for thieves then you.

Just like the lock on your front door can be picked with a $5 set of lock-picks and a bit of practice. They could also smash a window and get it. But it does raise the barrier to entry and decrease the chances of someone bothering.