Why? because they've been lied to for so long, they don't believe a word that their leaders tell them. They don't believe that there will be elections, they don't believe that Hamas and Fatah have any interest in respecting the results, they don't believe that there will ever be unity between the West Bank and Gaza.
The article listed all the previous failed attempts to get Hamas and Fatah on the same page:
Cairo Declaration Agreement, 2005The Prisoners Document, 2006The Mecca Agreement, February 2007Sana'a Declaration, March 2008Talks after Gaza war, 20092010 talksCairo Agreement, May 2011Doha Agreement, February 2012Cairo Agreement, May 2012Talks after Palestine's being called a "state" at the United Nations, January 2013Beach Agreement 2014Talks in Doha, 2016Cairo Agreement, 2017Al-Arouri and Rajoub agreement, May 2020Istanbul meeting, September 2020Cairo meeting, November 2020January 2021 Hamas agrees to Abbas' terms
The Arab world is sick of Hamas and Fatah. Palestinians themselves are sick of Hamas and Fatah. No one regards either group as being capable of any leadership.
And yet the EU, the UN and the US Democrats keep pretending that they can be peace partners.