The pictures are educational and sometimes entertaining. Standing beside a customer and looking at another electrician's work is something different.
If I needed to document something for litigation etc., I might use a picture. As to giving a customer the impression that another electrician did such poor work that it belongs in a record book - never.
This is a small city and I see the same electricians many times, and have worked with some more than once. I have borrowed tools from them, asked them for advice, bought material from them, and received work referrals from them. Posting their mistakes on the internet would be a pretty ****ty way of showing my gratitude.
it's a demonstration to a certain extent, that you really CARE about the Trade that you work within.
We are never going to fully agree on that.