When I first started flying for the Police in 1990, they had a number of items on their wish list: Digital mapping systems, Fully stabilised FLIR / Colour HD Cameras, greater endurance, greater carrying capacity, better night flying capability (i.e NVIS/NVG), winch capability.
Modern, lightweight systems, better computers and the move from singles to twins and then to more capable light twins (e.g. Explorer range and EC135/145) has met many of these wishes, but it has taken time.
The Police have always wanted to have as much capability in their hands as possible and winching is the next logical step.
Why? because they want it and occasionally they will need it.
Who? well they will of course.
But first they will lay down initial training and recurrency requirements, which will be approved in due course and they will go ahead. Nothing will be done "Ad Hoc" and nothing will be approved without showing that it can be done safely.
CRAB's text implies a certain element of "....but only we can do winching!" and "...they are trying to steal my jobs!" Not true on either score
By the way CRAB, if I have read too much into your post I apologise.