I drive, cycle, walk and take buses in London, and it astounds me there aren't more deaths. Actually, I think drivers are much more cycle aware than they were even five years ago, and I think that's because the electric rental bikes have brought a lot more bikes onto the road. So more drivers are also cyclists, and even those who never use bikes are at least used to seeing a lot of bikes around.
Some of you sound quite unaware, though. In London, where the speed limit is generally 20mph, cyclists are not delaying drivers behind them; we are generally moving the same speed. It would help if, when you're in your car, you remind yourself that you are driving not because you want to get there faster (you won't, not in London) but because you have luggage or children or bad weather or hills. You can still appreciate the luggage/children/warmth in your bubble while going the speed of the traffic around you.
Drivers in the city should not be trying to push past cyclists, especially since the Highway Code (and plain common sense) tell cyclists to stay at least half a metre away from parked cars that can swing their doors open without warning -- so the bicycle has to be in the middle of the lane. And drivers may not pass a cyclist with less than a car's width between them, which means only in places where they could equally pass another car.
Cyclists are supposed to stop in front of the queue of cars at every traffic light, not to the side or behind. That's why most marked intersections in London now have a box painted for cyclists at the front of the queue.
On the whole I do not see a lot of dangerous cyclists, and as far as I do, they're mainly dangerous to other cyclists (us grannies on bikes) rather than pedestrians. And they are not the infamous MAMILs. Some of them are in fact YMIL (young men in lycra), but as a PP said upthread, most of them are delivery cyclists who should be easy to register and number-plate. But by far the biggest danger on the roads everywhere are HGVs. It's astonishing in this age of in-vehicle cameras that any truck or bus is considered road-legal if the driver can't see all the way around his own vehicle.