I over simplify the whole issue
Well, I tend to over nuance this issue so let's call it a draw. I do think this is an issue where nuance matters but sometimes I stop seeing the forest for the trees. To be clear, I think that Israel has been a far greater villain in the history of this region that Palestine has. Whether it's been a greater villain than Iran - I'm not so sure.

I think that Israel is going to take actions any day now that they know will force the US to fight for them.
I don't think so but I'm really not confident on that. I certainly think we're looking at a ground invasion of Lebanon (which could get REALLY bloody given Hezbollah's numbers and combat experience) and I suspect rocket/air strikes on Iran. And then there'll be the ensuing reprisals and so on. Whether Iran and Israel will engage with each other on the ground is up for debate and I don't think conflict between Iran and Israel will be enough to draw the US into direct conflict - Israel can stand up on it's own in that scenario, albeit likely at a high cost in men and materials.

But

A lot depends on the reaction of the other Islamic states in the region. At the moment most of the noises are in support of Israel rather than Iran and a lot of the Islamic states have really had enough of Iran, particularly it's involvement in Syria. If that holds they'll stay out of it which will probably isolate the conflict to Israel and Iran. But it's a highly delicate situation and if Israel crosses any lines that those states have set for themselves (no idea what those lines would be), they could easily switch and then Israel could be genuinely threatened. In that case, yeah, I think the US would very likely step in on Israel's side. Really not a comfortable thought.