^The failsafes would come in handy for those occasions when Kirk might find himself split in two, possessed by a crazy woman, etc.
R. Star wrote:
Well TNG it required Riker or two other senior officers when Picard activated it. Janeway could just turn the thing on/off at will by herself.
So apparently the difficulty of activating the self destruct sequence is inversely proportional to how many viewers care if the ship is destroyed....