I was watching some Islamic scholar...give lecture(it was a video on YouTube...and I don't really know this Islamic scholar...so the credibility is not well established).
He was saying that he has travelled to US(met evangelicals there) and at other times and other locations has come into contact with Evangelical clergy...
...something related to debates/work pertaining to religion(bcuz Christianity and Islam share a great deal of commonality).
During this contact...he came to know about how much support Israel enjoys among the Evangelicals...in terms of money and ideological support...we r talking obscene amounts of church money(evangelical pastors are constantly running campaigns and ads asking for donations to the church).
So he inquired further as to why this is so...and the answer he got was that it is necessary for the second coming of the Christ.
So in short...knowing full well how the events of Armageddon will mean utter chaos and death and destruction...they are basically leading the sheep to slaughter.