we go as for back as needed to achieve a somewhat just society.

Let’s take your example of the Jews in Egypt (other than the fact that the source for Jewish slavery in Egypt is just religious texts without any archeological evidence ever found): is there some great opportunity divide between an Egyptian and an Israeli? no, so we obviously don’t need to worry about that.

or for the Ottoman-Slavic question: do Slavic peoples have less opportunity than those of modern day Turkey? no, so we don’t need to worry about that.

and yes, Italians (and many other parts of Europe) do send different types of aid to Africa for these reasons

Do Black people in the USA have massive opportunity differences in comparison to the WASP population? yes, they do, thus it is right to conduct these reparations. You may not be the only people to have committed slavery, but you sure still wear it proudly, and you are still a deeply systemically racist nation.

TLDR: it’s not about revenge, but righting wrongs.