I have a couple of neighbors who are quite mindless in ways they drive and care of their cars. Many start the car and speed away a second later on cold engine, short tripping is a norm for most, not changing oil, rattles and engine screeches are ignored, dead headlight or stop lights' bulbs replacements ignored, oil leaks and puddles, low on air tires, etc. Good area thou, and not cheap, most have good 'intellectual' jobs. Some have fancy cars but think that car a wash is maintenance.
Well, Mazda may have had a reason to deny warranty, or may have not a good one, we may not know whole story.