Isaiah uses a question to emphasize that Yahweh was the one that allowed the enemy to conquer the people of Israel. AT: "It was Yahweh who gave the people of Israel over to robbers and looters." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Isaiah uses another question for the same reason. Here "we" refers to Isaiah and the people of Israel. The word "they" also refers to the people of Israel, but Isaiah still included himself as part of the people. (See: [[rc://en/ta/man/translate/figs-inclusive]])