Cyclist assaulted on Chelsea Embankment

You really can't make such a sweeping assumption, much as I realise it may be borne out of frustration. (For the record, if you're partly referring to that case, 'those cyclists all rally together' was said once in the witness testimony, by the cab driver involved, and wasn't a particularly important part of the testimony.)

I don't know very much about the law, but I know that it's impossible to bring every case of violence/assault/verbal abuse before the courts. Ideally, of course we want to reduce such behaviour at source rather than controlling it by legislation and enforcement, but the reality offers no easy solutions. There are cases like the one linked to above which should never have come to court and a lot of shocking behaviour goes unpunished.

Bollox! Cab drivers' word is taken as bond by the establishment; "They are the ears of the city"®
If they say it, it's what many are thinking. I've been on the receiving end from courts/police in the past so gullible is not me.