Where is the rotten tail of the attacking giant?

The attacking giant is rotten to the extreme. It was Allen himself who killed his mother. Because Allen witnessed the giant eating his mother, he just wanted to expel the giant without leaving any land. As a result, in the finale, he found that it was the future Allen that caused Dai Na to eat his mother. Many people who should have lived died, but selfish little people who shouldn't have lived actually lived to the end. It turned out to be just a joke. After that, Allen was punched by Amin and sat on the ground in pain and shouted. In search, he wants to spend the rest of his life thinking about himself. This paragraph is also very disappointing. The war continues. Allen launched the Ming Dynasty to slaughter 80% of mankind, which not only did not end the war, but also made the giant's power disappear from this world, which was equivalent to directly lifting the nuclear threat. Why don't we just have an extinction ending?