Sending back Americanized slaves generations after their removal from Africa was never a viable or truly rational alternative. Even 150 years or so since many former slaves went to Liberia, there has remained a perpetual divide between native Liberians (those ancestrally living there) vs. the “Americans.” There’s never been assimilation and full reconciliation between the two groups.
No, you’d have literally had to locate the very tribes the people were abducted from, but even that wouldn’t have worked unless it was within a relatively short period of time. Bringing back the children or grandchildren or generations after would’ve been utterly alien (and presumably intermixed with other tribes) to those tribes. You begin to see how truly evil it was removing these people from their families and connections and dragged across an ocean... but abducted and captured by their opposing tribes, their own cousins selling them out.
Sometimes, the can needs to be kicked down the road; this would have been a case where an imperfect solution would have been a solution.
Bottom line is: If the contraband had been dealt with, current situations wouldn’t exist.