They attacked Christian pilgrims from Europe and closed pilgrimage routes to Jerusalem, hope this helped :)
He resigned because he'd already had enough trouble as president. Mainly the Watergate scandal. His plan was for him to step down and if he was arrested the vice president which would then be the vice president would pardon him. Also, if he didn't resign he'd likely be impeached anyway.
The reason they adopted this was to "A.Justify Revolution". This was because up to this moment there really had not been a formal explanation of the goals of the movement.
