Dear Boris......perhaps you should define your understanding of 'peripheral operators'!
Do you mean operators of smaller aeroplanes...or small operators with only a couple of aeroplanes....or non-UK operators or what?
My personal view is that operators who do not have adequate mechanisms for managing safety OR who fail to comply with their SOPs should be removed. However for this to happen the regulators (whoever they happen to be) must do some regulating. Currently they are obsessed with layers of regulation, bureaucracy, paperwork, tick boxes and seminars whilst Rome is burning! How else could the likes of Manx 2 (whoever they are) have got away with their alleged cowboy practices, known to so many (it would appear) for so long?
As to ATC being required to police weather minima, type of approach etc, I don't think so. The principle of airports and ATC in particular providing information whilst operators (and pilots) fly within their known minima has worked pretty well for many years in most of the world.
However, perhaps there is scope for some kind of immediate whistle blowing or approach ban when a known breach of minima is about to happen? (Similar to the UK scheme whereby CAA approved persons at an airport can prevent a flight from departing). Just a thought......discuss!