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You can stop math. Legally stop fb from using E2EE. You’ve stopped math. You haven’t stopped some people from using it. But you’ve prevented common people from having default usage of that math.No, you haven't "stopped math". You've enacted a law and stopped Facebook from using end-to-end encryption.
Math is universal. Math is something that should never be outlawed. Math is a fundamental right, an irrevocable truth based solely in fact. You can sooner stop alcoholism by outlawing alcohol than you can stop encryption by outlawing math. The idea of outlawing math would put us hundreds of years behind today; to enact a truth based on the church's "do this because I tell you it's true" instead of "understand this for yourself, I cannot tell you what is true". Outlawing math is dangerous and I cannot believe you are trying to make such an argument in good faith.
> Find a better way.
I do not believe there is a better way. You don't understand the math behind it. Instead of even trying to understand the math which is already widely understood by many, you instead want to make that math illegal and create your own. You don't even want to spend the mental effort to do that much: you demand others to do it for you.
> Two parties or three parties; three doesn’t have to be significantly more susceptible than two
This is factually false. The third party is a moving party which changes every moment. You can not meet that and still be "secure". It is antithetical to the very notion of encryption.