While normally I see no value in indulging in such hypotheticals given that we can no longer test them, seeing as how prominent Zionists have the audacity to liken Hamas or even Palestine in general to the Third Reich, I feel that in this case it is necessary.

It is a fact, not an opinion or a hypothesis, that the Third Reich supported Zionism. It funded Zionism, trained Zionists in agriculture, and allowed Zionist propaganda. The reason for all of this is simple: Zionism was (and is) the ultimate form of segregation. It segregates Jews not within Europe, but from Europe entirely. In order to encourage Jews to embrace Zionism, the Fascists wanted Palestine to look as appealing as possible for settling:

In April 1937 the Palestine Film Office released its first feature production, Hatikvah—A Document of Hope (1937, dir. Georg Engel) with all profits going to the Jewish Winter Help. Compiled from newsreel footage, Hatikvah presented images from Palestine’s pre‐war and Mandate period, thus summarising the technological and economic successes of the Jewish community in Palestine (Yishuv).

Visually the film leaves the impression that only the forces of nature hindered Jewish colonisation: stones are carried away, swamps are drained, hydroelectric plants constructed, and the land irrigated, while human beings, whether Jews or Arabs, appear only at the fringes.

[…]

The Tekufa Film Co. produced From Vadi Charith to Emek Hefer (1936, dir. Erich Brock, Walter Kristeller) for the Jewish National Fund; Timm Gidal shot Erez Israel in Construction (1936), and Ernst Meyer filmed The Way to Reality (1937) and Brit Hanoar (1937) for the Keren Tora vaʻAvodah [31].

These films dealt with Zionist colonisation and agriculture in the Kibbutzim, especially those settlements, which had been set up for German middle‐class Jews. Furthermore, they were meant to counteract waning Zionist enthusiasm in the diaspora following the Arab revolts of 1936 [32]. The films were usually shown with live musical accompaniment, and preceded by a lecture. […] The […] image of Palestine as a desert waiting to be colonised was reinforced.

(Emphasis added.)

While Hamas did not exist back then, if the films had shown, for example, the Palestinian uprising of 1929, it would have turned off viewers immediately. Thus they misrepresented Palestine as a terra nullius, overlooking the thousands of anticolonial Arabs there.

Hamas, and other anticolonial militants, only make occupied Palestine less appealing for settlers. Indeed, Jewish emigration is on the rise and many Jews are going to Europe, which was one of the last things that the European Fascists would have wanted.

Thus, it is almost certain that the Third Reich would have sided with the IDF, not only because it is exterminating non‐whites, but also because it is fighting to make the neocolony more attractive for Jewish settlers, thereby separating them from Europe.

The only counterargument is that this would have made the Third Reich even less appealing to the Arab world, which the Fascists did indeed attempt to appease, but I doubt that it would have been too great of an obstacle to overcome considering that Imperial America is already doing this and surviving.