I've always been amazed and truly dismayed at people who lose all sense of reality at WDW.
Disney is not a magical fairy land where all bad things cease to happen and bad people are barred by pixie dust curtains from entering. Disney is 4 theme parks, 2 water parks, 22 hotels, 4 golf courses, and a shopping center, and although I think they are the best in the world, with an excellent emergency response system and good security, they are certainly not some mystical la-la land where people somehow become "safe" as soon as they enter.
Disney is an entertainment complex. At entertainment complexes, people have to be allowed a wide freedom of movement, hence the somewhat lax security at the resorts like Poly.
Although some folks may feel uncomfortable at the thought of the longhouse doors (and other resort buildings at all the resorts) not requiring key cards, others might go ballistic if they did - "I'm paying $400 a night and I have to PROOVE that I'm staying here just to get into the BUILDING?! What kind of a hole is this place?!"
Although I personally find it somewhat irresponsible of Disney to turn those tiki torches off late at night and plunge the Poly grounds into dangerous darkness, others may have complained in the past - "I'm paying $400 a night to stay here and I can't get a wink of sleep because those darn gas torches stayed on all night long and the light kept flickering under the drapes into my room!"
And although some folks may want desperately to believe that WDW is a fairy tale Utopia where no bad things happen and no bad people can get in, I am not foolish enough to believe that the laws of physics, the laws of nature, or the laws of common sense alter their operation at the WDW property line. Bad people get in and do bad things; bad things happen; bad luck happens; and CMs are still falible (and sometimes even bad) human beings who don't measure up to the angelic standards that some want to hold them to - as are other Guests.
Because of this, I still avoid dark areas, maintain situational awareness, lock up my valuables in the hotel (including my laptop), and keep a close eye on any children in my party everywhere I go. My level of paranoia (everyone has some) is no lower at WDW than anywhere else in the world, because I'm smart enough to realize that WDW is still part of this world.
The proper term is "suspension of disbelief," folks, not "suspension of common sense."