At that point it's not about how much he loved his brother. It's about delivering his promise to get his brother out alive, even at others' expense. In midst of a battle, each soldier's sense of humanity vanished. It became all about survival. For Jin-tae, one part of that survival was ensuring his brother would get out alive.
To Jin-tae, war means protecting his promise, which which was made from the moment he went into that train to save him, to keep Jin-seok alive. He risked his life each way just to get a medal to get his brother out. It makes sense that once he realised his brother was alive, his sense of purpose would return with great force. No one else mattered, not even himself. He knew if he didn't do anything, NK soldiers would kill his brother, which would render everything Jin-tae had done completely worthless.
However, I think you should condemn him for shooting unarmed enemy soldiers earlier in the film, though. What he did in that case was morally and legally wrong. Condemn him for that, not the last battle scene.
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