Nobody is saying that lithium mines are a panacea but they are certainly better than oil extraction and refinement. Showing these "scary" pictures shouldn't sway anyone.
The water numbers sound bad until you do the math. A Tesla battery uses about 150 lbs of lithium, so one metric ton of lithium is enough for 16 EVs, over the entire life of the EV, so 31,000 gallons of water for 1 EV.
Meanwhile, 1 barrel of oil is estimated to take 1,850 gallons of water to extract and refine, so if you assume a 50 mpg car uses 70 barrels of oil in its lifetime, that's 130,000 gallons of water.
Obviously there are other components besides lithium that go into EV batteries, but my point is that it's probably a wash at best. And it's really about the CO2 emissions more than water, and EVs obviously save a huge amount of CO2, even if you are burning fossil fuels to generate the electricity because power plants are way more efficient than cars.