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So you are agreeing with me?

There is no way to sacrifice security to gain decentralization.

Security and scaling are the same variable (inverse).

Higher security always means less scaling and higher decentralization.
Lower security always means more scaling and lower decentralization.

I think I don't get it. Isn't permission and permissionless the secutiry sacrifice for decentralization?

I get what you are saying now. But you look at security as an enabler of decentralization.
I think the Trilema looks at it from the network access perspective.