The simple fact is, making certain guns illegal, only affects legal gun owners. The black market has, does, and will always exist. The same way people still smoke marijuana religiously, and cartels still make their fortunes off heroine. I believe yes, @c13 is very right, they need to invest more in how to react outside of your vehicle, but also, the bullet proofing is a very effective measure to prevent the executions of officers in their vehicles we have seen recently. I think there is nothing wrong with outfitting patrol cars with these options, there will always be bad guys, and they will always have the guns they want.