Unlawful assembly can be interpreted in many ways.
As an enforcer of the law, the police are expected to be able to
apply both lenient and stringent connotations where
applicable.
In packed areas, it makes absolutely no sense for police to
question every group > 5. Not only does it make them look silly,
it makes the law itself look stupid outright.
When a gang of 6 beat up a defenceless individual, obviously the
public will expect the police to act, and act swiftly to deter
other would-be aggressors. Failing to do so would mean our police
are weak and lack the will to enforce the letter of the law in such
circumstances.
After all, our police force are always preaching prevention rather
than reaction.
This case highlights their hopelessness and failure to act as
required.