Kayano, I think it's reasonable that ALL road users follow the laws of the road.
However, it's clearly unreasonable to misdirect our limited police and law enforcement resources when we clearly cannot stop all lawlessness on the road.
That being so, I really question the priorities of someone who wants to target cyclists rather than say the people doing 50mph down the 30mph residential road I have to cross to take my children to school.
I fear for their lives every time we cross it. Nobody stops to let us across. There are no police enforcement patrols, there is no lollipop lady, the pelican crossing that has been asked for for over a decade costs too much. Car drivers do not heed rule 170 of the Highway Code (or many of the other rules, for that matter).
While I have been annoyed by cyclists, felt that they passed me, as a pedestrian, too close, seen them put themselves at risk by going through red lights, NEVER have I felt any existential threat from cyclists, whereas that's a fear I have EVERY FUCKING TIME WE CROSS THE ROAD - is a car going to come round the corner at 50mph? Is that driver going to stop? I am at their mercy.
Frankly, if a cyclist got in my way, while I was on foot, it would be as likely to injure them as me.
I was riding my bike yesterday, here. I was in the road, and I saw a cyclist on the pavement. I thought 'why isn't he on the road?' Then after I pulled off from the light in the right-hand lane of three (the only one that goes straight ahead so it was that or try and merge into the speeding traffic from one of the nearside lanes), accelerated to 25mph to avoid getting cut up by an impatient motorist behind me, I realised: however annoying a cyclist on the pavement might be (and it is just that, an annoyance, and nothing more, in all but a tiny, tiny number of cases), the roads are in many places intimidating, hostile and outright impossible to use unless you have above-average fitness and a great deal of competence, so they don't have many options (yes they can get off and push, blah blah blah, I know, but I don't care, sorry, perhaps you could lobby for some proper cycle infrastructure instead).