One can only hope that (a) the idiots didn’t hit anybody as they sped through the Mall, and that (b) those that do this kind of thing get pulled over for it.
(1:21pm on Monday)
As you can see from Google Streetview, there is signage/road markings indicating that when coming westbound on Bourke Street, motorists shouldn’t enter the tram stop — they should do a U-turn and go back.
(Ironically both the Google Streetview car and another vehicle can be seen driving through the tram stop — though the other vehicle is a loaded ute which parks in the Bourke Street Mall, so it may have had permission to be there, where some exceptions apply, though this does not appear to be the case for the Bourke/Swanston tram stop.)
I suspect the answer here is the City of Melbourne needs to close Bourke Street to vehicles all the way up to Russell Street; or at least ban motor vehicles from entering and heading westbound (but allow them to leave eastbound eg if they’ve come via Royal Lane or Russell Place.