Only the first set were scripted. The second set had their ai actions overridden.
I also don't understand why they don't do it.
But no offence, but I feel the game creators kinda rushed through the police notoriety/AI, like it was done last minute before the release (That is also why all my questions are police related, because I'm fixing all the bugs and I also tweak the notoriety the way I like it.)
I will look into the NPC grenade throwing.
And for your pleasure, here are some bugs I found after playing the game for a pretty long time and some more bugs after studying the notoriety_spawn.xtbl
When STAG is active, STAG Commander boats actually would show up, but they don't. (When I look at the notoriety_spawn.xtbl there is a part about the STAG commander but it doesn't spawn. I was able to make it spawn though, with some tricks.)
(Btw, now we are talking about boats, there is an SNG commander as well, why doesn't that one spawn at notoriety 5 as well instead of the police commanders when stag is not active?)
Though the tornado at 4 shields belongs to the SWAT, it is flown by an SNG soldier. (Take the RC Pocessor and put it down on the ground and see for yourself, an SNG soldier will come out instead of a SWAT officer. Already changed it myself)
A police officer driving the SWAT riot vans (doesn't make much sence to me, just like the thing above, already changed this to a SWAT officer)
According to the notoriety_spawn.xtbl file, at level 3 police notoriety there already should spawn SWAT riot teams, but that doesn't happen in game (Already fixed this, it was caused because the game didn't allow any specialists to spawn at three stars and maximum two occupants per vehicle. Further it says that there is a 30% chance a swat van appears and 70% chance an unmarked cop car appears.)
At 4 shields police cars have 3 officers in it. (Caused because the SNG bulldog and the police car at notoriety 4 share the same data, which tells the game that at 4 shields each vehicle can have maximum 3 occupants (2 SNG soldiers in front and one gunner) which also applies to the police car because of this. Already fixed this simply by adding that each police car only should have 1 driver and 1 passenger next to him.)
Unmarked black police peacemakers show up only when on foot, not when driving a car. (I fixed this already by placing the data for this vehicle to another place, so it spawns also when in a vehicle.)
In the Roadblock_Layouts.xtbl there is a second 2 lane roadblock for notoriety 3, just like there are 2 differnet ones for the small roads at notoriety 2, though the notoriety 3 one never spawns. I fixed this by adding the roadblock its name to spawnable roadblocks at notoriety 3 in the roadblock_notoriety.xtbl.
I'm not sure if the unmarked black police peacemaker only spawning on foot and the swat van being driven by a police officer is a bug but I count it as one.