DATA-DOG:
Thank you for your comments. The saying, after the opening statement can be broken down into a ABBA type pattern. Where "A" is the illustration and "B" is the statement that the illustration supports:
Opening clause:
Now as for the times and the seasons, brothers, YOU need nothing to be written to YOU. For you yourselves know quite well . . .
ABBA statement:
A - that Jehovah's day is coming exactly as a thief in the night.
B - Whenever it is that they are saying: "Peace and security!" . . .
B - then sudden destruction is to be instantly upon them
A - just as the pang of distress upon a pregnant woman; and they will by no means escape. . .
By analysing it this way, it can be seen that:
What "they are saying peace & security" about is "Jehovah's day." To illustrate, if a family went to bed without locking the house, they would , in effect, be saying they are not worried about "a thief." This would have nothing to do with whether the husband and wife were getting along, or whether the kids were doing good in school. It only says that they are not worried about the possibility of a thief breaking in. This very much parallels the idea in Luke 17:26-30 where Jesus says that people would be going about their business blithely unaware of his return.
A few weeks after Jesus spoke in Luke 17, in Matthew 24:36-42 the same illustration is used (although with less detail than in Luke) with the addition of, "and they took no note." The people of Noah's day had an attitude of 'peace and security' only in connection with the possibility of divine intervention. Whatever other problems they faced were moot to the discussion. (See here for variations of "and they took no note.")
These sayings of Jesus were already circulating among the disciples when Paul wrote 1 Thessalonians. This is why Paul could say that they 'knew these things quite well' already.
It is also interesting that the object of the verb ("are saying") is left unexpressed. It is simply "they." "We" know, but "they" are unaware. But in verse 6 "they" are identified as "the rest." And "the rest" don't just fall asleep sometime in the future, but they are already "asleep."
In other words, as far as divine intervention is concerned, "the rest" already had a 'peace and security' attitude about them. That attitude would continue until the day of divine intervention suddenly broke out. Similarly, in Luke and Matthew above, Jesus isn't saying that during the last days people would start to 'marry and plant and build.' Rather, they would be continuing to do those things as they had been before. It is just that any evidence of his coming return that comes to light during the last days is ignored also.
The Society's idea that "world leaders" would be promoting a 'cry of peace and security' is pure speculation built on a saying that is taken out of its context. This is why their history is full of false alarms. Every political situation that might involve 'peace and security' that comes along just might be it. But never is. On the other hand, seen from Paul's viewpoint, "world leaders" are a part of "the rest," and so their actions and attitudes exemplify how "the rest" view a possible divine intervention.
By the way, the ESV better captures the sense of the what Paul is saying:
While people are saying, "There is peace and security," then sudden destruction will come . . .
The NWT's, "Whenever it is that they are saying . . .", shows that the translators already believed in a 'peace and security' event when they translated 1 Thess 5:2.
Take Care