Because that's what matters. The original Zionists aren't alive to ask what they think. Self-proclaimed Zionists are taking the West Bank and Gaza. In fact they've been kinda doing it for decades under previous governments, but more slowly. If there's some other kind of Zionism around, the most it's doing is complaining, and it's been outvoted.

I have doubts about their ability to self-defend because otherwise we wouldn't be giving so much money, the situation would be stable. Even if they can severely hurt the attackers, it doesn't really matter if the attackers stop at nothing. We just lost a war against Iran despite having full air superiority and killing their leader. And especially if you're considering the scenario where Israel never got Western support, and thus never got those advanced weapons.