Thousands of people needlessly incur hot tap scald burns in the shower or bath each year. The treatment for scald burns is sometimes as bad as the injury, and the after effects go on for life. For the most serious cases, a civil liability for negligence often follows the injury.
The liability can be on the house or apartment owner, so explain to the owner on the next plumbing call, and make a friend. Liability can be on the plumber for setting the thermostat too high. Liability can be on the designer for not specifying safe conditions. Liability can be on the water heater manufacturer for failure to properly and sufficiently warn of the dangers of scald burn. Liability can be on the tempering valve manufacturer, if one is installed, if the valve does not fail safe. And on and on.