Rewind to the Great Disappointment.
The Bible at the time, at least where I come from, was very revered amongst almost any demographic. A real source of energy if one could only "explain it."
I'd be willing to bet that Matthew 24:14 was used, as it still is today, as a means to measure groups that were attempting to organize and preach the Gospel.
Matthew 24:14 - And this gospel of the kingdom will be preached in the whole world as a testimony to all nations, and then the end will come.
Questions that may have been asked about groups of that day:
How many people do they have? What is their capability? How well are they organized? Is it even possible for this group to preach to the entire globe?
You see, the Bible's Last Days Mission is somewhat of a mission: impossible and the advent groups seemed like they wanted to be Tom Cruise.
They didn't like their lives, obviously, since they wanted to usher in the new world and get a lot of people killed. It's a desperate thought process to condone collateral damage of that magintude for any reason. That's why it was such a great disappointment because they had to go back to the lives they hated after their leaders were exposed.
So a new demographic was formed! And business type people pay attention to new uncharted business demographics!
To cater something to a demographic a formula must be created that is designed to entice it. So what formula would you use if you wanted to entice a "disappointed" demographic?
I would find a way to convince them that they were wrong to be disappointed! Get them excited about the future!
But wait! The "future" can't be too far off I have to remember these people are pessimists.
Get them exited about the not too distant future then!
In comes the Watchtower! They had been working on their "not to distant future" formula for a while then and they were ready to launch the product of Security!
Their slogan could have been something like this:
"Disappointed? Feeling insecure? Get security here!"
It was something people wanted to hear so they took a bite like they always do.
The problem is it's a FALSE sense of security. It's designed to cater to a demographic therefore is NOT real.
Reality isn't a sure sell so most people don't try to sell it.