James is right.
However, I along with others would feel the 'scum' comment fine, but in an official capacity it is not reasonable to make that observation.
However, technically it was not and should have not been said, mags are not normal people...they must be objective and refrain from making these comments.
Hmm, I'm not sure about that. :-/
At the end of the day, a magistrate is surely entitled to "grade" a crime. He/she may call a crime "heinous", "disgusting", "vile" etc. In this case, as I read it, the magistrate was pointing out the fact that, in his opinion, most people would regard such perpetrators as "scum". That is a subjective view, but not necessarily his/her own view.
Maybe I am being too pedantic. 
That is a good, strong point Nickbat...and I must admit I do agree with it.
But even though I agree with it, I couldn't fully support it.
The law is a very prescious and delicate thing.
A mag must not let personal feelings get in the way, but more importantly they must not
appear to let that happen.
As a police officer, member of the judiciary or other such position it is your job to uphold the law, and do that in the most professional way. There are infact certain words you are allowed to use to descrbie criminals and their acts which are deemed acceptable. Scum is not allowed, and other such words as animals. This does slip by on many occasions. It is very rearely challenged.
Lord Denning, as any Law student (me included) will tell you had very forthright opinions and was outspoken, but even he agreed with the rules.
It is very interesting to read his reports and ideas and correlate it with Hansard.