Why would states risk being dragged into another war by joining an alliance?

Question

Quizplus · Accepted Answer

States join alliances to increase their security and deter potential enemies from attacking them. By signaling that they will support their allies in times of war, they can make it clear to potential enemies that any attack on one ally will result in war with the entire alliance. This helps to prevent war and maintain peace. However, this does come with the risk of being dragged into a war if one of their allies is attacked.

Why Would States Risk Being Dragged into Another War by Joining