Was the Trojan War wroth it?

Trojan War was unworthy/ meaningless, selfish and cruel when I saw the movie of Helen of Troy. The war was born in the beautiful woman, Helen who was wife of Spartan King Menelaus and the Paris, prince of Troy. Paris and Helen were fall in love and he took her to his hometown Troy. I thought it was unworthy because Menelaus knew Helen did not love him, why he wanted to have the war for her. The war also was selfish and cruel. Menelaus’s brother Agamemnon was killed his daughter to get the winds. How can do that? I could not forgive him to kill his daughter even though I knew he felt guilty. I thought he did not love Helen, he just want to have sex with Helen and own her. I did not think this was the reason to trigger a war. I thought maybe Agamemnon also wanted to get the rich state, Troy so he had war. Finally, I really thought the Trojan War was unworthy.