QatarA340,
Much as I think a lot of the posts above are unfair, as no legal system is perfect, it proves nothing that you can find one case where there was insufficient evidence to make a charge stand. That's what happens in a legal system where guilt must be proved- and there was little doubt of guilt in the case this thread is about.
If you wanted to get into that sort of tit-for-tat I could take your OJ (For which there were no witnesses) and raise you an Abu Dhabi Prince torturing an Iranian (for which there was a video!!!).
AT LEAST these guys were convicted and will do some jail time.Not enough, and, no, probably not as much as an Expat might expect for the same crime.
BUT if they are first time offenders they would probably have gotten off with a suspended sentence in a Western country.