I dont subscribe to Honda+ either. Just a suggestion.
I agree the Jazz is not at high risk of being stolen, and a thief able to steal it would probably have a relay theft scanner that would unlock the car anyway.
If the risk is from someone entering cars and stealing their contents locking the car only offers partial protection. If they can see something in the car worth stealing, eg a handbag , they may just smash the window. You've lost the bag and got a window to repair.
I'm not saying dont lock your car. It will deter those thieves who just try doors until they find one open but wouldnt risk drawing attention to themselves by smashing a window. ( a car alarm activating is still a risk, but often ignored .

) . And car boots would also open. Insurance companies wouldnt be happy. (or rather, they would be happy because they can refuse to pay your claim)
I wouldnt be happy accidentally leaving my car unlocked, but not to the extent of taking extra elaborate precautions. (even a Honda+ subscription

)
I do wonder if dark tinted rear windows affects the risk. Will thieves be more likely to ignore your car if they can see there is nothing inside worth stealing, but break into tinted cars to check? Maybe insurance premiums are adjusted for this as well as the extra cost of replacing tinted glass.