That doesn't address him not doing that to Vereesa.I assume he spoke with Renthar and Aurora because they were both closer to Silvermoon and also in more dire straits than the High Elven contingent in Dalaran. His immediate concern was to provide both resources and security to Quel'Lithien Lodge to help them with the Scourge remnants in the area. I don't doubt that he was primarily motivated by his own regrets (especially in regard to the High Elves at Quel'Lithien, who he put in the line of fire due to the exile), but Lor'themar also wouldn't pursue such a course without it also benefiting the Blood Elven people. If he thought reintroducing the High Elves to Silvermoon would be a net negative he wouldn't have acted based on the same logic he used to exile them in the first place.