Please explain where the illegal occupation is, and how you define occupation. Israel occupies the West Bank, but not Gaza. And the terrorism is coming from Gaza - not the West Bank.

And, no, it is not the reason for decline in western support. The reason for the decline is an extensive propaganda program by Iran and Russia, meant to target liberals with misinformation. In addition, the UN has been usurped by a myriad countries without any human rights, and they are getting the majority vote.