The analogy of doing electrical compared to changing brake pads in terms of public safety just isn't valid.
If I do a poor job working on my own brakes, the only time the public is in danger is when that vehicle is driven on public roads. If I do a poor job installing electrical in a building, the public is in danger 24 hours a day, 7 days a week, every day until the unsafe condition is corrected.
I may not be driving my truck right how, so how unsafe are my brakes? At this moment, they are perfectly, 100% safe. NO ONE is going to be injured or killed by my being mechanically challenged at this time. BUT, an unsafe electrical install is ALWAYS LURKING THERE.