Nothing like turning to the Telegraph for an example of unbiased commentary...
The problem I have with the use of the words "smear campaign" is that, to me at least, that ought to imply that all the smears are made up, or at least heavily exaggerated. This wasn't made up, and it doesn't look exaggerated either (nor even is this an isolated incident).
As to the question of what Braverman has done wrong: it's not difficult to see what. In the first place, as Attorney General she was the Government's chief legal adviser. It stands to reason that someone whose job it is to advise on the law ought to follow it at all times. So, already, even a minor offence like speeding is falling short of the high standards of that office. Still, had it ended there with a swift apology I suspect most people would have moved on quickly. But it didn't, as she instead sought, or appeared to seek, any and all possible routes to avoid accountability or culpability. And of course it entirely clashes with the general message of upholding the rule of law.
More generally, it's about declining standards of high office. It is not, I think, a uniquely Tory trait to show contempt for such standards, but it *is* a trait common to Governments who have got too used to power, and too complacent as a result. In that sense, this is a sign of a Government nearing its end.