Is it? Perhaps as a staff member I have a different appreciation of the assaults, confrontations and other things that occur, particularly later at night and in the early hours.
I've said the current situation is clearly not satisfactory, but what the solution is I can't say. For me, you'd someone build a new bridge to modern standards with proper monitored access.
The one thing the trial will do is give a baseline to work with, both in terms of revenue, numbers of people using the bridge and staff assaults.