I understand your point of view, but the GK went out for the ball, missed it, and took the man down in the process; how is that not a penalty? Running into a striker without making contact with the ball is a straightforward penalty. Didn't you notice how quite the GK was? He never protested because he knew what he did was wrong; if VAR had intervened, it could have resulted in a red card, which is why the Croatian players did not push for it. They were aware that it was a penalty and accepted their fate
The goalkeeper didn't have any contact with ball before he knockdown the argentine player which mean that it was a clear penalty. It would have been a big blunder on the side of the referee if he had failed to give that penalty.
But I think the Croatians defended very badly in that match. After the first goal they became desperate to level up but failed to coverup for a potential Argentina counter attack. The second goal came because of this defensive lapses. The third goal was a result of Messi football prowess. He singlehandedly created that goal scoring opportunity.
My heart goes to the hard-fighting Croatian side. They have suffered so much heartbreak from the world cup because they have always been close to the trophy but never had the opportunity to win it. Its time for Luka Modrić to retire as a hero because he has contributed immensely to the development of his country's football.