Whatever the comic pretensions of hacks like Parris, Clarkson and Littlejohn, someone will do as they are told, and there will be no way of proving it. All it takes is a little delay on the brake pedal and another cyclist is dead. And that delay can be caused by the hatred spread by the media. In effect, it is the most efficient form of incitement there is. At least with other forms, the means of execution are explicitly criminal and rarely able to be disguised as an accident. This is not the case when the murder weapon is a car. And is much too easy when the target is suitably demonised by the media - when people on bikes have been dehumanised to a problem on wheels.
In the critical second or two before a collision with a cyclist, anyone agreeing wholeheartedly with Clarkson, which he presumably hopes is as many readers as possible, would not first see a human being in danger but just another obnoxious bloody cyclist - and only finally, when it is too late, see the human being. It is not a conscious decision, just an unnecessary, synthetic emotion getting in the way of the normal human response.
This is something which happens all the time - especially to drivers, subject as their personalities are to the distortions of being in control of superhuman power. We call it Road Rage.