Agree with all below, but it’s also readily available and doesn’t hurt you back.
Something like tear gas requires an armory, people to go and get it, bring it to the place and deploy it, and of course it can be used back on your own forces.
Water is pretty much guaranteed to be where ever you want it, just tap in to a fire hydrant with a hose and you have a weapon. Considering the force and velocity of it, it’s also less likely the water will “waft back” into your own forces.
It works, but it is not necessarily the most effective method. Shooting people is probably a considerably more effective method. You eliminate some of the unwanted people, and will generally scare off the rest. As a general rule people prefer to be alive than dead.
Killing your own people is generally frowned upon on the international stage–especially if conspicuously done. Water can cause injuries, but is generally non-fatal, so is a preferable method (albeit less effective) of crowd control.
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