It's a question of matching perceived with actual risk. The incident reported in the Guardian sounds terrible and utterly terrifying, but it happened over two years ago. According to Islington and Hackney LCCs two or three years ago there was a period of cyclists being targeted, but police action had subsequently reduced this.
The recent spate of attacks is worrying, but the only one we have details of happened at 2:00 in the morning. It would be useful to know from the police the time of day/night when the other attacks have been happening. During the day, at commute times at least, there is a near constant flow of cyclists, children being walked to school and a friendly atmosphere. The last thing we want is everyone being scared off the street so that the whole area really does become no-go.
I think this raises a larger question about how we respond to perceived risk to ourselves when out on a bike. We know that when it comes to risk of traffic injury on a bike, perceived risk is far higher than actual risk of injury, and as a result we have people being deterred from riding. This results in fewer bikes on the road and a slightly increased risk to all. I would suggest that we have a similar pattern when it comes to street crime.