I don't like the karma system for two reasons:-
(1) If someone asks a question & gets a technically correct answer,but doesn't like it,they can then give the answerer an adverse rating,although they have done nothing wrong.
(2) It is frighteningly easy to make a mortal enemy on these forums,so if you upset someone,they can for no sensible reason,give you an adverse rating.
If this was a political,or sporting forum,people's opinions are just that,--opinions,but things like electrical laws are not opinions,& there is no use "shooting the messenger".
VK6ZGO