According to my concept:
all «common sense» trader’s rules and laws is a fake
further more they may be used in invert form to create a good stable working system (all common words must be replaced)
as sample : trend is your enemy: why?
it’s simple because there is no working system that allows you to stay on trend and not lose more in case of trend absence
that’s all
P.S. «nobody is your friend» — this is a best concept for work in the market and to survive in any kind of jungle