Cop might as well shake his fist at airplanes. Streetcars are governed by the railway act.
As for blocking the intersection, that's a tough call as we don't have all the info. I suspect that if every streetcar driver waited to enter an intersection until there was an entire streetcar worth of space on the far side, the streetcars would just be parked and never actually make headway.
Shared road/streetcar infrastructure is a complete failure. Since King was redone to prevent vehicle travel along the length, streetcar transit times have increased by something like 30%. King needs a rethink. The hardware for red light cameras could easily be modified to grab vehicle plates proceeding through illegally. That should be a few thousand tickets a day. Streetcars should have cameras and ability to hand out tickets too. If you are blocking the lane, driver presses a button that takes video and picture of your vehicle, time, location, plate, etc for review by a cop who can mail you the ticket. That ticket needs to be an order of magnitude higher as it is $60 so nobody cares.