Since the new rival list, you can rob anyone and everyone and anyone and everyone can rob you. Thats not very fair and many people don't like these changes. There needs to be some update that makes it so you can protect your hood from other rivals and the idea im about to present is a good start to that.
Add a new LTB, The Robsafe Insurance Agency
The catch here is that this defence building doesnt grant you defence. Instead upon every upgrade you receive a -5% opponent rob modifier maxing at 50% at level 10.
This building doesn't make you fully immune to robbers because that wouldnt be fair, but it severely cuts down on the amount youve been robbed for.
As of right now when you rob someone you get 25% of the buildings payout per hit with no modifers. If you upgrade this LTB to level 10 any rival that doesnt have a rob increase modifier will only be able to rob you for 12.5% of that buildings pay out, meaning it would only pay out in 2 hits what it used to pay out in 1.
Note: You can only have 1 of these LTB's and you have to buy and upgrade it with RESPECT POINTS.