Why does it only take one veto of apermanent member country for NATO?

In NATO, decisions are made by consensus, meaning that all member countries must agree for a decision to be adopted. This principle ensures that each member has an equal voice in the alliance and can protect its national interests. Since NATO's founding, the inclusion of a veto power for permanent members reflects the importance of collective security and the need for unity among diverse nations in military and strategic matters. As a result, a single veto from a permanent member can halt any proposed action, reinforcing the necessity of diplomatic negotiation and cooperation.