In order to answer this question one has to remove the element of emotion. (I am a former 30-year JW by disassociation)
Persons of ALL religious organizations believe that what THEY have is "the truth." Each of them claims that "the other guys" do not have the truth.
A false prophet is anyone or anything not sent from God and who makes predictions and utterances that do not come true.
There has not been one religious organization who has uttered a prediction or foretold something that has come true. Not one.
I remember back in 1986 many Witnesses believed that that was the year Armageddon would come. Many cashed in life insurance policies, sold their property and so-forth. Well, that year came and went without event.
The year 1914 is a date in which the very foundation of the WTBTS is built upon. It is the date that they claim as the end of the "Gentile Times" and when Christ received his Kingdom over the earth.
Well, this date is false as well for several reasons: (1) The date did not originate with the Watch Tower organization. It originated with the Second Adventist in the 1800s in which Charles Taze Russell was a member. When he broke away from that movement he adopted the 1914 date when he started his International Bible Students Association. If God has always had a faithful and discreet slave on earth - as the WT claims - was the Second Adventist that slave also since the 1914 date came from them? Obviously, the WT does not address this and would answer, no." (2) Something Jesus himself said at Matthew 24:36, Matthew 24:42 and Acts 1:7: That no one knows when Christ is coming. That information is privy only to the Father in heaven. So for humans down here on earth to be establishing dates is in direct opposition to what Christ stated. Yet, humans are stubborn and are listening to their religious organizations and not to Christ. (Luke 9:35)
So what I am saying is this: Remove the "emotional" element from it all and recognize that "the truth" is not human and it is not of human origin. The truth is not within any religious organization on earth because neither God or Christ established any religion on earth. Men did this on their own accord. Christ was not sent to earth to establish a religion. Religion is a mechanation of the devil.
The truth is a person. This person speaks only what God has directed him to speak. That is why he alone is The Word of God. No book by any name and no organization by any name is "the truth" or the "Word of God."
Jesus [the] Christ is "The truth" and nothing he utters by way of prophecy will fail. That is why it is imperative that "he" be listened to and not religious organization.
Jesus said of himself at John 14:6:
"I am the way and the truth and the life. No one comes to the Father except through me."
Many have forgotten this and ascribes "the truth" to religious organizations and to a book.
The world is sick with humans and human agencies teaching and speaking false things.
Reliance in "the truth" Jesus [the] Christ is the ONLY way to be sure that one is on the right path and not being led astray by false utterances.
One must detach themselves physically, spiritually and emotionally from ALL religious organizations and attached themselves to the living Master Christ Jesus.
Sadly, many do not want to do this. Since they will not, they will always defend the religion and wander around in the dark thinking that they are in the light.
Treat anything and everything spoken by humans as false until it is tested. (1 John 4:1)
The Watch Tower organization is not immune from such examination. It claims its members are "in the truth." This is a clever way to get out of being tested in accordance with 1 John 4:1.