People will write bad code in every programming language you give them. I don't see that as a justification for limiting the expressiveness of a language. If you take that line of reasoning too far you end up with Java.
That's a straw man. I never said that the expressiveness of the language should be limited. There are plenty of languages that are just as (more?) expressive than CoffeScript without the syntactical ambiguity.
> If you take that line of reasoning too far you end up with Java.
That's the slippery slope fallacy. I am in no way suggesting that CoffeScript should have completely rigid syntax. Surely there is a happy medium between CofeeScript and Java. There are plenty of languages that live there.
Even python's critics would admit it's a very readable language, and it would be unusual to claim it's not expressive.
x = 3;Is it really more expressive just because there are N ways to do it?