IMHO,
It is not wise trying to scare off thieves (when they are in your house compound) with parangs, petrol, insecticide or so what ever. This is because the gang may return for a revenge... you may not know that they might harm your family members or just destroy your home for nothing... (throw bricks at windows) (spray paint the walls and etc). If you really need to kill them, please do so.. but don't scare them off... it will not work on them!
Gone DEFi, APEXi can be repurchase with money.. but not life & peace of mind itself.
The best you could do, if such event occur is that you try your best to identify the thieves in terms of their features and their registration plates on the escape vehicle. That will help in investigation.
Remember of this malay proverb. "Sepandai pandai tupai melompat.. akhirnya akan jatuh ke tanah juga" It is just a matter of time they will be caught red handed by the useless police or suffer and die in a crash because of their bad "karma"