Alright, so we're now talking about the protocol.
so where is this trustless system you mentioned?
Can you be responsible for not allowing you others to cheat you? Then it's a trustless system. Now if it's easy or not to protect yourself this way is another thing to discuss. I take the fact that before I couldn't do a thing, but now I have an extra option.
multisig requiring third party signing is not trustless independence, definitely not permissionless
When you want to close your channel? You've already got the signatures before you even open it.
by now admitting that cheating can happen and maybe can be discouraged via other features. please try to say cheating can happen but can be discouraged..
Of course and cheating can happen. This is true for everything. Someone may also rip you off in the Bitcoin network by maliciously gaining access to your keys. It can happen with physical cash too. The fact that they're discouraged to do so (hopefully) makes it safe.
When you're more encouraged than discouraged to play by the rules is when things work properly. I have never been cheated by my lightning partners, have you?