What I don't understand is if I want to access a particular password from keychain I have to enter my master password. But if I let someone use my machine for a

What I don't understand is if I want to access a particular password from keychain I have to enter my master password. But if I let someone use my machine for a few moments all they have to do is hit "Always Allow" and they can have all my passwords? That is jacked up, Apple.