There is no proof of any dates set armegeddon.
If you research this carefully, you will see that the Watchtower Society has been trying to set the date of Armageddon ever since the days of its founder, C.T. Russell, who preached it would be 1914. Then when that didn't happen, they changed the interpretation / understanding of 1914, and pushed their Armageddon expectations ahead in time.
t depends on what you call the end of the systems of things? That not armegeddon
I'm unclear about what you mean here. I was always taught by JW's that the end of the system is the SAME as Armageddon.
Nor did they claim the Fall of Jerusalem was 607
You are mistaken about this. They base their 1914 date (for the "end of the Gentile Times") on the 607 B.C.E. date.
Besides it was close enough I do not think that 587 was correct either.
Every scholar and historian agrees on the 587/586 BCE time frame for the fall of Jerusalem. It was in the 18th year of King Nebuchadnezzar, who began reiging 18 years earlier (in 605 BCE). You can check any encylopedia for the dates of the Kings of Babylon, including online at http://en.wikipedia.org/wiki/Kings_of_Babylon .
And what about the other religions? Did they set dates?
Not the mainstream religions. Just the ones influenced by William Miller and Adventism.
Did they kill people
Religions didn't kill people, but their members sure have. And sometimes, it's been justified. Would American religions like JW's be free if the military hadn't defended them during WW2 instead of letting the Nazis just march all over Europe and eventually here?
Jehovah's Witnesses never killed anyone!
Maybe the adherents haven't but the religion has. The prohibition of blood transfusion has killed thousands, including the innocent dead children whose faces were shown on an Awake magazine cover back in the 1990's. Also the cruel disfellowshipping policy has led to serious cases of depression and suicide, a direct result of the control the religion seeks to establish over its members by denying basic human companionship to ex-members.