While polls generally show that roughly half of US voters plan to vote for Trump, that's in the context of only being given the option of Trump or Biden. Most polls I remember seeing since 2016 show roughly 1/3 of the US really consider themselves Trump supporters.

The Israel/Palestine question has similar problems. A binary poll question sets the context that a respondent needs to be on one side or the other, and that supporting or opposing both sides isn't an option. It also puts respondents in a position to have to pick a side regardless of how much or little they may know about the situation. With no more context, a 50:50 split could mean simply that most people don't know enough to decide and randomly pick a side instead.