There were a couple of reasons. A simple one is that the Greeks of the time, the 13th-11th century BC Mycenaeans, were a people with war as a central part of their culture.
A more politically complex reason does involve Helen of Sparta. Helen was the daughter of the king of Sparta. She may have been as beautiful as the myths claim, but truthfully it doesn't really matter. Whoever married her would inherit the throne of Sparta and become king. The man chosen to be her husband would only be king of Sparta as long as he was married to Helen.
Menelaus, the brother of King Agamemnon of Mycenae, ended up marrying Helen and earning the throne. When Paris and Helen eloped, Menelaus knew he would lose the throne to Sparta. Getting support from his brother Agamemnon, who as ruler of Mycenae was interested in keeping Sparta under his control through Menelaus, Menelaus gathered allies and struck out against the Trojans.
She wasn' t really in a war but she did start the Trojan War.
The Trojan war was the Greeks against the Trojans
Helen did not start the Trojan war pelccaria did
He was the leader who led the Trojan war, later on killed by his wife(not really mentioned in Greek mythology)
She is the god of discord that yells at the start of the Trojan war
She wasn' t really in a war but she did start the Trojan War.
The Trojan war was the Greeks against the Trojans
Helen did not start the Trojan war pelccaria did
The Trojan war was proven by, when people found evidence like armor and journals.
He was the leader who led the Trojan war, later on killed by his wife(not really mentioned in Greek mythology)
In the city of Troy.
The Trojan War.
She is the god of discord that yells at the start of the Trojan war
Aristotle was born about eight hundred years after that war.
He was on the losing side during the Trojan War.
Personally I would say that the Trojan War was more about war than it was about love, although an element of love plays a role in the story, as reported to us by Homer.
Poseidon did not play really any role in the Trojan war but in the Odyssey he cursed Odysseus and created almost all of the problems he had to face.