

Self defense needs limits. Wait to find out more details before judging. He could have been beating an unconscious person with a baseball bat for 10 mins for all we know. Defense of property doesn’t merit risk of a life. Only defense of life should be worth life threatening force.
Most let you set a minimum/maximum temperature that it will never willingly cross. Keeps things like pets and pipes safe while not needing to have it be at optimal human temperature all the time. Most these settings are user adjustable.