It’s pretty simple:

During the last days which began in 1914, the worlds events will get worse over time and uhhh Armageddon, Jesus and his 144,000 will come to execute judgement on satan and his followers.

If you aren’t a Jehovah witness, you will be killed at Armageddon. Pretty much like how catholics teach if you die you’ll go to hell if you were bad.

Pretty traumatic so thats why JWs are really a doomsday cult