A script meant to disable multiple scripts (100+) only changes a few?

Hello! I'm making an obby and I have a script which disables the script of every kill part if you have a certain gamepass, sort of like an easy mode. However, they only work on a few of them, and they're all parts I made first, before all the others. Additionally, I discovered that the scripts that do get disabled, are disabled for everyone in the server, which I don't want. An error pops up "Script is not a valid member of Part", I don't understand why this happens.

Easy Mode Script:

local id = #######

local killPartFolder = game.Workspace.killParts 

for i, part in pairs (killPartFolder:GetChildren()) do
    
end

game:GetService("MarketplaceService").PromptGamePassPurchaseFinished:Connect(function(plr,ido,purchased)
    if purchased and id == ido then
        for i, part in pairs (killPartFolder:GetChildren()) do
            part.Script.Disabled = true
        end
    end
end)

game.Players.PlayerAdded:Connect(function(plr)
    if game:GetService("MarketplaceService"):UserOwnsGamePassAsync(plr.UserId,id)then
        for i, part in pairs (killPartFolder:GetChildren()) do
            part.Script.Disabled = true
        end
    end
end)

I'll also add the script for the kill parts. It doesn't actually "kill" the player, it teleports them back to their last checkpoint.

Kill Script:

local debounce = false

script.Parent.Touched:Connect(function(hit)
    local player = game.Players:GetPlayerFromCharacter(hit.Parent)
	local tp = workspace.Stages[player.leaderstats.Stage.Value]
	local char = hit.Parent
    if debounce == false then
        if char:FindFirstChild("Humanoid") then
            char:moveTo(tp.Position + Vector3.new(0,10,0))
            wait(1)
        end
        debounce = false
    end
end)

This is a very inefficient way of doing things, because client scripts cannot disable server scripts, and server scripts cannot destroy server scripts for only specific players. This whitelist should be built into the kill parts themselves, e.g.

function getplayer(instance)
    for _, v in pairs(Players:GetPlayers()) do
        if v.Character and (instance:IsDescendantOf(v.Character) or instance == v.Character) then
            return v
        end
    end
end

script.Parent.Touched:Connect(function(hit)
	local player = getplayer(hit)
	if player and player.Character.Humanoid and not game:GetService("MarketPlaceService"):UserOwnsGamePassAsync(player.UserId, gamepassId) then
		player.Character.Humanoid:TakeDamage(math.huge)
	end
end)

Disabling scripts on its own is really bad practices. Disabling hundreds of them, that would be critical. I suggest using Bindable Events instead, it's way cleaner, although you're gonna need to edit those 100 scripts.