Your claim needs evidence. A hypothetical murderer could open a door and push people out, no weapon necessary. In a fire, passengers could fall out a door onto third rail.
But are those risks less than the risk that in an emergency the doors can't be opened at all and the entire carriage of passengers are effected, eg burnt alive?
The old system of windows that slide down with a handle on the outside of the carriage seemed to work pretty well - hypothetically you could open the door and push people out or fall on the track. Wonder how many times that happened?
The old system of windows that slide down with a handle on the outside of the carriage seemed to work pretty well - hypothetically you could open the door and push people out or fall on the track. Wonder how many times that happened?