Hamas doesn't even claim to represent all of Palestine. They represent the Gaza strip which they governed legitimately after a free and fair election. They would indeed probably win in the west bank too if the collaboration government there held elections, but the Axis of Resistance is a broad coalition of groups opposing the illegal "Israeli" occupation of their land and ethnic cleansing of their people, and includes all sorts of colorful groups like the Marxist PFLP and general-nationalist Lion's Den, as well as foreign groups like Hezbollah.

It's just that braindead western propaganda only talks about Hamas because they're the scariest to white people. They're "like ISIS" as the vile Zionist pundits are quick to remind you every time they come up in the news (simply a ridiculous, childish comparison). Calling it the "Hamas-Israel war" is intentional to obscure the fact that it is the Zionist entity that is waging a war against the entire population of Palestine, and has been doing so for decades.