Right-of-conquest = might-makes-right
Then we can use the same justification for the Holocaust, that others have done the same things and might-makes-right.
What relevance is ancient Israel to you using the term "terrorists" ?
Oh and before Jews created ancient Israel, it was inhabited by Caananites, who the Hebrews genocided, according to their history. Lebanese are 1 of the groups who are the descendants of Caananites.
What has Muhammed got to do with Palestinian claims on what is now Israel? Palestinian vs. Israel is an ethnic conflict foremost. Both Christian and Muslim Palestinians support the Palestinian cause. Decades ago , many of the early anti Israel Palestinians were Christian.
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Since you bring up Israel's ancient claims...
Palestinians have a greater ancestral claim to those lands than most Jews, since they are descended in large part from the Levantines (including Jews) who lived in the area since ancient times. Palestinians are more Semitic than most Jews.
Most Palestinians Are Descendants Of Jews
In 1956 the PM David Ben-Gurion sent Moshe Dayan with a rabbi to start giving lessons in Judaism to Bedouin in the Negev.
Was Ben-Gurion suddenly struck with missionary zeal?
He was just acting on knowledge that he and Yitzhak Ben-Tzvi, the president, has talked about for years. Most of what we now call “Palestinian Arabs” are descendants of Jews. Among the Bedouin that could reach 100 per cent.
https://blogs.timesofisrael.com/most-palestinians-are-descendants-of-jews/