All living beings on Earth require water. There is only so much we have. Currently only 1.2% of water on Earth can be used for drinking, as the rest is either frozen, salty, polluted, or used for other purposes.
Any decade now, our water will run dry. This is already happening in places in Africa, where issues with water compound with already present civil issues. If you say, "Well, that's only happening because their country is in a bad spot to begin with..."