Good questions.
See if this link to Jewish understandings of the Ten Commandments are of any assistance
jewfaq.org/10.htm
The point about the crusades is, I think, even better made by looking at the conquests in the Hebrew Scriptures that were commanded by God. There is no previous claim by Jews to these lands. They conquered and took them from people who were already living there. A few:
Deut. 2:24-25
24 “Set out now and cross the Arnon Gorge. See, I have given into your hand Sihon the Amorite, king of Heshbon, and his country. Begin to take possession of it and engage him in battle. 25 This very day I will begin to put the terror and fear of you on all the nations under heaven. They will hear reports of you and will tremble and be in anguish because of you.”
Joshua 10:40-42
40 So Joshua subdued the whole region, including the hill country, the Negev, the western foothills and the mountain slopes, together with all their kings. He left no survivors. He totally destroyed all who breathed, just as the LORD, the God of Israel, had commanded. 41 Joshua subdued them from Kadesh Barnea to Gaza and from the whole region of Goshen to Gibeon. 42 All these kings and their lands Joshua conquered in one campaign, because the LORD, the God of Israel, fought for Israel.
Joshua 12 (the entire chapter is a list of lands and kings conquered by the Jews)
1 These are the kings of the land whom the Israelites had defeated and whose territory they took over east of the Jordan, from the Arnon Gorge to Mount Hermon, including all the eastern side of the Arabah: 2 Sihon king of the Amorites, who reigned in Heshbon. He ruled from Aroer on the rim of the Arnon Gorge—from the middle of the gorge—to the Jabbok River, which is the border of the Ammonites. This included half of Gilead. 3 He also ruled over the eastern Arabah from the Sea of Kinnereth [a] to the Sea of the Arabah (the Salt Sea ** ), to Beth Jeshimoth, and then southward below the slopes of Pisgah. 4 And the territory of Og king of Bashan, one of the last of the Rephaites, who reigned in Ashtaroth and Edrei. 5 He ruled over Mount Hermon, Salecah, all of Bashan to the border of the people of Geshur and Maacah, and half of Gilead to the border of Sihon king of Heshbon. 6 Moses, the servant of the LORD, and the Israelites conquered them. And Moses the servant of the LORD gave their land to the Reubenites, the Gadites and the half-tribe of Manasseh to be their possession." etc
Joshua 23
1 After a long time had passed and the LORD had given Israel rest from all their enemies around them, Joshua, by then old and well advanced in years, 2 summoned all Israel—their elders, leaders, judges and officials—and said to them: "I am old and well advanced in years. 3 You yourselves have seen everything the LORD your God has done to all these nations for your sake; it was the LORD your God who fought for you. 4 Remember how I have allotted as an inheritance for your tribes all the land of the nations that remain—the nations I conquered—between the Jordan and the Great Sea [a] in the west. 5 The LORD your God himself will drive them out of your way. He will push them out before you, and you will take possession of their land, as the LORD your God promised you.
2 Samuel 5
6 The king and his men marched to Jerusalem to attack the Jebusites, who lived there. The Jebusites said to David, “You will not get in here; even the blind and the lame can ward you off.” They thought, “David cannot get in here.” 7 Nevertheless, David captured the fortress of Zion, the City of David.
1 Chronicles 11: 4
4 David and all the Israelites marched to Jerusalem (that is, Jebus). The Jebusites who lived there
to name a few.
BTW, reborn, if you want to look up or check Biblical references easily and in a variety of translations, I would recommend www.biblegateway.com**. It’s good for anything not included in the Apocrypha (I trust some of the Catholics here might be able to recommend another site that would include that).
The simplistic answer is that it was G-d’s will (and who are we to understand or to question). The immorality would have been in not carrying out G-d’s commandments. Had the Jews disobeyed G-d they would have been punished by
G-d as a people.
We have G-d’s destruction of the world by flood or His destruction of Sodom and Gemorrah (Abraham’s debate with G-d to spare the cities if ten righteous men could be found).An example you missed is the destruction of Pharoh’s army by drowning in the Red (Reed) Sea. Pharoh chases after Moses and the Jews with his army after G-d has hardened his heart.
The talmud debates these moral issues. It is propositioned that G-d demanded the total destruction of the Cananites because had the Jews not done so and tried to form an alliance, the Cannanites would have later turned against the Jews and destroyed them.