Some of what I’m going to write here is conjecture. But it’s informed conjecture, and you are welcome to judge it for yourself, and to do your own research until you realize that it explains everything.
Israel should have invaded Rafah first, and not left it until the end.
This much should be obvious. After all, the vast majority of the military supplies in Gaza entered through the Rafah tunnels from Egypt. And had we started with Rafah, it would have had a much smaller population, and it would have cut the rest of Gaza off from the Gaza “smuggling” routes.
(I put “smuggling” in parentheses, because you can’t really call it smuggling when both sides of the border are happy with the arrangement.)
The reason we didn’t start in Rafah is almost certainly because the US pushed us not to. The reasons they gave were most likely along the lines of, “If you start a military action that close to Egypt, you’ll endanger the Egyptian peace treaty.” That would have been the easiest thing to say, and it would have been taken seriously by both Israel’s security establishment and Israel’s government.
The question, then, would be why they didn’t want us to start in Rafah. And it’s the same reason that they don’t want us to finish there. It’s because what we’re going to find once we get there.
We’re going to find that Egypt has been facilitating the arming and support of Gaza (Hamas, Islamic Jihad, etc.) for a very long time. Probably since Hosni Mubarak was deposed as President of Egypt in 2011, during the Arab Spring.
Egypt has made a big show of destroying Gazan tunnels at Rafah. But a big show is all it’s been. Destroying “Potemkin tunnels” while maintaining the ones transferring arms to Gaza.
The United States really doesn’t want us to find the evidence of this. And at this point, it’s too late to destroy it all unnoticed. One reason, the lesser reason, that they don’t want us to know about it is that they fear a collapse of the Israel-Egypt peace treaty and the major destabilization that would cause. But the other, far greater reason, is simply this:
Egypt didn’t do it on their own.
In 2011, Barack Hussein Obama was President of the United States. His behavior during the Arab Spring was peculiar, to say the least. When the Green Revolution erupted in Iran, he did absolutely nothing whatsoever to encourage the sane Iranians to overthrow the mullahs. Not a single word of support. Deafening silence from the White House.
Meanwhile, the relatively moderate Hosni Mubarak was removed as President of Egypt, and replaced by Mohammed Morsi, of the Muslim Brotherhood, the organization which spawned Hamas.
Morsi had famously proclaimed in 2010 that:
“The Zionists have no right to the land of Palestine. There is no place for them on the land of Palestine. What they took before 1947–48 constitutes plunder, and what they are doing now is a continuation of this plundering. By no means do we recognize their Green Line. The land of Palestine belongs to the Palestinians, not to the Zionists."
This means that all of the land between the river and the sea belongs to the Arabs.
He also referred to Israelis as “blood-suckers”, “warmongers” and “descendants of apes and pigs”.
It most likely at this point that the Muslim Brotherhood veteran started arming the Muslim Brotherhood spin-off, Hamas. I don’t know whether Abdel Fatteh al-Sisi, who replaced him as Egyptian president, was aware of Egypt’s arming of Gaza, but the American hysteria (there’s really no other word for it) about Israel going into Rafah suggests, strongly, that America was involved covertly in this activity. And that when Israel gets into Rafah, we’re going to find evidence of it.
This is why they diverted us from starting in Rafah, and this is why they’re losing their minds over us going in there now. They can see Israel holding the evidence up to the world and condemning the United States as a faithless and traitorous nation. What they don’t realize is that such a thing would never happen. Not under any of our current leaders. Israel's “battered woman syndrome” will prevent us from making this public, because our leaders won’t want to risk American “friendship”.
Such as it is.