They were facing a much better side, that is far more athletic and ready, who scored first.
Had Inter scored goals first, like they did against us and Bayern (2 gullible teams with worse defenders) they would have looked more strong mentally.
Inter was behind for total of 6 minutes in the whole tournament before the final. That was the 6 minutes against us. There other time was conceding last minute against Leverkusen
And it wasn't because they were some juggernaut of a team, they defend fairly well and count on opponents mistakes to win games. They were worse team in each of their quarterfinals and semifinals games.
Last night, opponents didn't give them mistakes, and they were force offensively, they had the better coach tactically too. Inter were simply helpless and it showe.
No mentality or shit, just better showing that they were actually mediocre.