Removing player control code not working?

So I recently needed a script for my game that removes a player's control over their player (changing the movement to be click-to-move)

Code:

for _, controller in pairs(game:GetService("ControllerService"):GetChildren()) do
	controller.Parent = nil
end

The code IS in a LocalScript in StarterGui

You Cannot Delete Controller Service But You Can Override Them In PlayerStarterScripts here's an example (for a local script)

local function onCharacterAdded(character)
local humanoid = character:WaitForChild('Humanoid')	
humanoid:SetStateEnabled(Enum.HumanoidStateType.Jumping, false)	
humanoid:SetStateEnabled(Enum.HumanoidStateType.Climbing, false)
humanoid:SetStateEnabled(Enum.HumanoidStateType.Running, false)
humanoid:SetStateEnabled(Enum.HumanoidStateType.FallingDown, false)
humanoid:SetStateEnabled(Enum.HumanoidStateType.RunningNoPhysics, false)
humanoid:SetStateEnabled(Enum.HumanoidStateType.Seated, false)
humanoid:SetStateEnabled(Enum.HumanoidStateType.StrafingNoPhysics, false)
humanoid:SetStateEnabled(Enum.HumanoidStateType.Swimming, false)
end