Tony Stark’s first words when he gets back to earth are “we lost” and “I lost the kid,” and if you don’t think that humanity comes first and then immediately Peter Parker for Tony Stark then idk what to tell you. Tony Stark risked everything to bring Peter Parker back! He was not going to go down that rabbit hole of time travel until he looked at Peter Parker’s picture. And Harley was at his funeral!!! Iron Man 3 was in 2013! And Harley was at a very private, very personal send off that the superheroes had for Tony. He and Happy were the only people there not actually related to a Super which means that Tony considered Harley as his family. Listen what I’m saying is, Tony Stark had three children and after everything has been said and done in these movies, he has proved that he is the guy to make the sacrifice play. For humanity, for his kids.