The case in question was 10 years ago in Romania, which was only just becoming an EU member that year. I have no idea what sort of laws applied at that time in that country.

But generally, employment in most european countries is not as tenuous as you suggest. You need valid reasons to get rid of someone, and usually you need to give the employee fair warning and a reasonable opportunity to improve or correct the issue that led to the warning. Nobody gets fired for sending a single email even if it's in violation of a clear company policy.