This goes to both, criminals and cops.
Currently, killing a turret is the garbage work. While other people are standing around and killing the enemies, you have to do the bad work killing the turrets and the others profit from not doing it.
Is that teamwork? No, you do the work alone, and don't get any reward. (For example as a cop: Other cops are killing the criminals, while you kill the turrets for them and you get no reward, they steal all the reward)
Then everyone moves the work to another person because noone wants to waste his time by killing a turret while the other persons are doing the actual fighting.
Example:
(I will use cop as an example)
Lets say you are cop and you are infront of many criminals with turrets. You have 2 more cops with you and you try to arrest the criminals, so the other cops are shooting into the criminal mass and you are all getting shot by the turrets
People are NOT killing the turrets because it's a waste of time, they'd rather get the kill because if for example you are a cop and you kill the turret, you will only waste ammo and the other cops will get the arrests.
To be realistic, the actual "heros" are the people who destroy the turrets because that opens the space for the other people, but the people who kill the turrets aren't getting any reward, while the others in the meantime kill the other people and get the kills / arrests...
So I suggest that if you destroy a turret you get a reward (like 1/2 of turret price) so people who kill the turrets aren't the idiots who do the garbage work for the others so the others have free space, but so that the people who do that work actually get a reward, because they are missing out on the kills they could get when killing the people.