What the diplomatic arrangements were between the Roman Empire Palestine and Egypt aren’t clear to me. Apparently it wasn’t as big a deal then as it is today. Egypt would have been happy enough to have a Jewish community in it, as they were an industrious, productive people (that’s how they also made good slaves centuries before, a problem that never recurred with Egypt). If all the people clambering over the southern border had the mind of the Ellis Island immigrants, we wouldn’t be in this uproar. They don’t, and we are.