system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why the Euro would crash if Greece exited it

I still don't understand why Eurozone countries would rather bail them out (at significant costs). Is the cost of them quitting the Euro worse? I don't get why.
gpt
To a five year old:
You and a bunch of friends are sitting at a lunch room table at school. You are all real close, share a lot of history together, and everybody sees you as a group rather than a bunch of individuals. One day, your friend Winston accidentally craps himself while giving a history presentation. Now the entire school will no longer talk to you, or your friends because you are all associated with Winston craps-his-briefs. 

Your group of friends is Europe, Winston is Greece, crapping his briefs is defaulting, and nobody talking to you is the world refusing to loan you money because one of the Countries in your association couldn't pay back its debts.