I think people actually do though? They are even sabotaged at times (has happened in Europe at least), to protest against their water usage.

Rather than talking in absolute numbers, ratios help relate human activities better, an example:

If we can close 1 in 3 golf courses and have all the water we need for data centers - and then some - would that be acceptable to our society?

Do we desire so much golf that we'd prefer to stress our water systems instead?