I accept that the assertion was not worded clearly. That said, consider that the breakup of a single hulled mid sized fuel barge, with thousands of barrels  of heavy fuel oil or Diesel has the potential to create a marine disaster every bit as epic or worse than leak or puncture in a large double hulled,  compartmented offshore tanker.  Both coasts run these types of craft, but some four fold greater numbers out east. Eastern tanker transits ply far more km of  sensitive inland routes than on the west coast.

There is simply no comparison, the east coast with some 8000 annual inbound + outbound tanker trips, the west coast with 1500.  East coast refineries supplied in.large measure by foreign Oil, offshore oil production occurs out east while none permitted west.

Alberta and BC held hostage awaiting social licence  while the east coast refines, imports and offshore drills as it pleases. Ridiculous.