Morning C6PT7
It could be any number of reasons why Disney does not do bridge tours.....C6pt7 you mentioned one...on the side of extreme caution, to prevent someone evil minded person from even trying to cause a problem. Frankly it would be easier to effect the sat nav system from the outside (tampering with the sat signals/ nav systems from a site off the bridge and even off the vessel) then from *dropping* something on the bridge. It has already happened on commercial and naval ships.
I would add as I pointed out earlier, there are other areas to where to bridge controls can be transferred, including the ER (power systems , steering the propulsion). All systems could be monitored from these areas and watch standing and lookouts could be outside. Radar and electric chart overlays, emergency systems, etc. can be monitored from any established location inside. On the Classic vessels there is a set of ports in the upper area under the foremast, which is said to be a emergency bridge area. However I do not know if that is a fact.
The bottom line and the reason I don't feel the bridge is a real security issue, is with all the backup systems double checking the vessels position, course, speed and traffic in the area and time honored good and proper watch keeping by bridge personal, it his pretty hard to cause a problem that will not be caught pretty fast.
I think DCL does not normally have bridge tours on most cruises, because there are only limited times they could permit bridge tours, namely away from heavy traffic areas, near ports, or restricted navigation areas, etc. During a cross Atlantic voyage as MJ pointed out, they have had limited bridge tours out in the wide ,basically empty North Atlantic.
Another reason is I think Disney feels if you make a limited number of people happy with bridge tours, you are still going to make a lot of others unhappy because they did not have a bridge tour.
I understand why people would love a bridge and Engine CR tour, but to be honest, except for the radar/ nav screens its really mostly all buttons and lights. I came ashore 30 years ago and when I goon the ship bridge these days to its like walking on the bridge of the starship Enterprise, all techno!
AKK