where incidents have happened before that has not happened
there are thousands of accidents every day. clearly accidents. The "incident" you are describing was an accident, and clearly an accident.
There is no comparison between something that is clearly an accident, and something that is possibly an attack.
sure there is some overlap, and somethng that is possibly an attack may turn out not to be,
but you are comparing common, every day, accidents with incidents that could be an attack.
The man outside the natural history museum was breaking and swerving to try and avoid a collision.
This man drove at speed firstly into cyclists then into a high security barrier in a sensitive area.
Of course one gets more coverage than the other.
I don't know what you expect?
most attempted attacks don't get as far as actually injuring people, and may not be public knowledge, and so don't get coverage, but if someone drives at speed into human beings, then into a highly secured area, of course it is far more newsworthy than someone having an accident