I'm not sure what result you expected. True or not, claims of atrocities committed by your government are always uncertain in practice - people will argue whichever way depending on their goals and beliefs (like we're doing here just now), so even if you believe them, unless you've actually seen them first-hand, they're always somewhat abstract considerations. Meanwhile, the fundamental reality for people in Gaza is that they're being bombed left and right by some outsiders. So when more outsiders come asking them whether they still like their government - government who, other than committing atrocities in what they sell as defensive war, are also responsible for keeping food, water and power flowing while bombs dropped by outsiders keep raining down your streets, does anyone expect majority to say "no, we don't like our government - please keep bombing us until we find a better one"?

I bet if you polled the population of Iraq of Afghanistan in the middle of US invasions of either, you'd get similar results supporting the evil government too.

Dropping ordnance on people has a way of skewing their responses in political polls away from what you'd expect in a stable democracy.