I usually try to avoid describing someone as 'evil' but I am struggling to think why it wouldn't apply to anyone who thinks that car owners should have greater freedoms than public transport users.
Of course, this would
never be the case in law.
How anyone could try to give people some sort of moral lecture to say they shouldn't be using public transport to make a journey that no-one is deterred from making by private transport is beyond my comprehension. I find their corrupt morals utterly repulsive.
Just knowing that there are people who think like that, and they are being given a platform to promote these distasteful views, makes me feel angry. I'd relish a face-to-face argument with these people
I can see some logic to it.
People going by private car (or cycle/foot, even horseback) are not coming into contact with other people - as part of their journey. Thus the risk of transmission between unrelated people is just not there. Whereas on public transport, the risk can be mitigated but not eliminated - through cleaning regimes, distancing and face-coverings (if you are a believer!).
My gut feeling is that the risk, on a lightly loaded vehicle, if people follow the guidelines, is pretty small. Not much chance of a person with the virus being on the vehicle in the first place, not much chance of it being transferred, not much chance of it being a viable amount of virus, and if all those fail, there is only a small risk that you will get it bad. I would have a different view, and modelling would produce a different result, for a crowded tube or commuter train - you know - the face in armpit situation. Theoretically, the risk could be modelled (garbage in, garbage out applies).
Similarly, when restricting travel by all modes, by reducing the amount of movement generally, fewer people are coming into contact with fewer people in a different geographical area, so less transmission.
I wouldn't regard the designers of the policy as evil, I doubt they have a grudge against public transport users, but I do think that many of the people making decisions on public transport generally (regardless of COVID) do not depend upon it. They may use it out of choice eg for commuting into cities where the drive and parking is awful, but they probably have a car to fall back on if needs must.
Legal? The model regulations I found the other day show that thought has been given to legislating on movement, rather than merely advising against it, including by road in your own vehicle. Obviously legality depends on whether the whole of the COVID Act and the various Statutory Instruments are legal or not.