But if my neighbor miswires a light switch and it starts a fire that burns my house down because they're close together, that would suck. In that situation, I would have wanted a say in whether my neighbor chose to do that themselves or hire someone who knows what they're doing.
I'm living in a house that is filled with small jobs that seemed like they were done by someone who didn't know what they were doing. Lots of scrap lumber, mis-matching parts, electrical re-wires that just didn't work, etc. I'm glad I don't need a permit to fix some of that myself, but I would've loved to stop this guy before he did these things.
Or if someone's half-assery endangered otherwise innocent lives. Note: not necessarily crying "save the children!" "Innocent" as in "couldn't influence decision to get someone who knows what they're doing".