I was on the ferry to Victoria, BC via Seattle this week and I sure thought about terrorist attacks to ferries. It is a LONG way between land and too cold to swim IF one survives a blast!
I agree on the swim and have had thoughts of the same thing here back east. Personnel already search for propane, fuel tanks and other flamables that are on the prohibited list.and they run special hazardous trips for gas tankers etc.
It's all up the master of the vessel and the regs he has to follow as to what goes on his ship. If the ACLU doesn't like it let them start their own navy.