Earlier quoted context omitted.
Backfeeding houses with generators is indeed a killer feature... but not in the way you mean. It can be done safety, but when done incorrectly (if the house isn't removed from the grid first) it can kill linemen. It's a good thing most generators a homeowner might causally buy at the hardware store don't have this feature. Unfortunately I've seen male-to-male extension cords sold online for this purpose. I think thes…
Yes you definitely have to get it installed by a licensed electrician (and possibly approved then by the local utility) if you are going to backfeed your own house. It is good that people are aware of the risk, but in reality the risk is quite low. It is standard procedure for a lineman to ground a line he's about to work on, to mitigate the risk of any power source feeding it. But I'd never advocate a DIY setup. But…
How many linemen are killed a year in the US due to backup generators or similar? Are there no procedures they can do to work on lines safer?