system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does Israel spy on the US?
gpt
Everyone spies on everyone as much as they are able if they are smart.

Making decisions requires information. If you don't have correct information then you are less capable of making the right decisions. Therefore if you value making the right decisions then you must also value pursuing accurate information, even if those people with the information don't really want you to know. You see, the people making the decisions swore an oath to their own people and owe it to them to make the right decisions, and they don't owe the people who want to keep secrets anything at all.

This is why everyone has spies of varying ability, even if nobody wants to talk about it.