More to the point, a languaage that doesn't provide the tools to manage when, where, and what "dangerous choices" you make is much less worthwhile than a language that does.

C#, for example, doesn't let you modify objects passed in as parameters, unless you highlight that behavior on the method signature and the call itself with the appropriate keywords. There are many other examples in many other languages. "Do what you want, use convention to keep safe" is a recipe for trouble that has caused innumerable very serious defects in software (buffer overflows, security vulnerabilities, etc.) "Do what you want, and you have all these tools to keep track of it" is a much better choice, even if in the end the code does the same exact thing. Banking on humans not making mistakes is not robust.