Human nature. Maybe they can’t accept and admit that they f’d up and are at fault. Blame hardness, machining etc. anything but themselves.
I wiped out my first big camshaft, for some of the above reasons. 100% my own fault. At least I admit it. (A purple shaft mini express. Too much spring, vacuum leak, old fuel. I wish I could get another mini express and try again.....)I know a major issues with wiped cams is guys Dont know how to start a fresh engine. I see guys with dead batteries, distributors 180 out, old fuel or low fuel, trying to prime and engine by turning it over instead of the right way, etc, etc.