I'm not really sure how wasting a bit of water while brushing your teeth in Berlin could be considered particularly immoral or unethical. Berlin is, as far as I

I'm not really sure how wasting a bit of water while brushing your teeth in Berlin could be considered particularly immoral or unethical. Berlin is, as far as I know, in no danger of water shortages and being more frugal with water in Berlin does nothing whatsoever for the billions of people in the world who have no or limited access to safe water supplies. Am I wrong?