You're missing quite a few important facts and detail there.
President Abbas has lost control over a northern swath of the West Bank, especially after he called off an election. Polls indicated Fatah would suffer another humiliating defeat to Hamas. Around two-thirds of Palestinians opposed his decision to call off the vote.
On top of that, there is considerable support in the West Bank for terrorist groups who reject the authority of the Palestinian Authority. Palestinian pollster Khalil Shikaki and his Palestinian Center for Policy and Survey Research (PCPSR) found that 72% of Palestinians support forming more armed groups in West Bank. 65% of Palestinians in West Bank support the concept of armed groups taking NO orders from the Palestinian Authority. Numbers were higher in Gaza, where 84% of respondents backed the concept.
A minority of Gazans do NOT support Hamas.
Even Abbas' Fatah party has an armed wing. Around 14% of Palestinians supported them in 2021. Hamas has more support.
True that Palestinians are not a monolithic group.
True also that a majority of Palestinians support Hamas and a majority in the West Bank support armed groups taking NO orders from the Palestinian Authority.
The worst thing for all Palestinians is for them to completely reject the Palestinian Authority. Palestinians believe the Palestinian Authority is weak since they're willing to work with the Israeli Government. Hamas fully exploits that issue to great effect.