What do you mean ? I you don't use synchronization protection when you access your structures from different threads, you'll have the same inconsistency in your data. Using the explicit Mutex of Go doesn't seem so different than creating an object on which synchronizing your blocks as you do in Java.

Or do I miss something in your comment ?

EDIT : In my opinion, a program that doesn't crash and goes on running with inconsistent data structures is mainly hiding a failure which will appear in a worse way later (for example when those data will be used). To fail fast is often more secure. But my opinion may be based on the fact that I see too many java programs which seem to work but that nobody can touch because they're just in the lucky state where bugs don't surface too much.