Help with :Changed function ?

-- ================================================================
local lplayer = game.Players.LocalPlayer
local Players = game:GetService("Players")
repeat wait() until lplayer.Character:WaitForChild('Head') and lplayer.Character:WaitForChild('Torso') and lplayer.Character:WaitForChild('HumanoidRootPart')
local Head = lplayer.Character.Head
local RS = game:GetService("RunService") 
local HumT = lplayer.Character.Torso
local HumRP = lplayer.Character.HumanoidRootPart

function OnPlayerAdded(plr)
        plr.CharacterAdded:connect(function(character)
        RS.Stepped:connect(function() 
            -- =====
            character.Changed:connect(function(Property)
    if Property == "CanCollide" then
        HumT.CanCollide = false
        Head.CanCollide = false
        HumRP.CanCollide = false
    end
end)    
        end)
    end)
end

for _,v in pairs(Players:GetPlayers()) do
    OnPlayerAdded(v)
end

game.Players.PlayerAdded:connect(OnPlayerAdded)
-- ================================================================

It only changes HumanoidRootPart's CanCollide to false, and when there is 2+ players it doesn't change the CanCollide of anyone.