The Hamas government isn't democratic, but it was democratically elected. And voters knew whom they were voting for, Hamas didn't change, they were a terrorist organization back then as well. Voters democratically elect all kinds of dictatorships. Still their fault.

Indigenous people (legitimately imho) started a war over that territory and lost it. Started a few more and lost those as well, together with some neighboring states. If you lost the war for that land, it isn't your land anymore. Simple as that. And terrorism isn't an acceptable means of warfare.

I'm pretty sure the violent colonizers who implemented a pre-meditated plan of conquest https://en.wikipedia.org/wiki/Plan_Dalet are those who started the war in this case. "Right of conquest" was not part of international law anymore at that time.

They did not really win either, given that indigenous people, and their descendants, did not yet settle for their complete submission. Unless you call victory as having to hide behind walls and running to shelters every once in a while, and constantly making new enemies by bombing shit out of everyone around you.

As to the fault of the voters for what happened after elections. Yeah, that's easily debatable, given the massive foreign interference into the post-election Palestine's politics and society from occupation, and third countries, and attempts to coopt oposition for violent overthrow of elected government. Also Palestinians did not vote for terrorism, but for "change and reform" at the time http://news.bbc.co.uk/2/hi/middle_east/4606482.stm