Why should other countries have to help other countries who are going through wars?

Do you honestly think any of these countries would help the US or UK if they where in the middle of a war? Why should it be the job of another country to help someone else's country? The US and UK and other rich countries should focus on helping their own people and not care about any else from any other country. It's the other countries leader to do that job.
Why should other countries have to help other countries who are going through wars?
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