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This was majorly embarrasing for the 99.9999 per cent of other electricians who will now find that homeowners won't trust an electrician unsupervised in their house anymore.

Of course there are many honest and nice contractors. But after having worked in the electrical trade myself and having had lots of work done at home I certainly won't trust ANY tradesmen unsupervised! First you never know what they're actually doing, second and more important, tradespeople have a strong tendency do do what they THINK the customer want's - which is sadly often the exact opposite of what the customer really wants.
I just remember an architect friend of my parents who was supposed to do the general plans on a basement remodel but ended up nearly being fired because he messed with the interior design, like specifying pink tile, pink walls and pink and green flourescent lighting...