experts dont ''guess'' on stock trading and when you dont need to guess you dont need to use silly strategies
In fact, martingale is being used in stock trading alot ( binary options to be precise ). Strategies aren't meant to make you "win" but it is to reduce your chance to "lose" . I don't see any reason on why not on using a strategy as it helps you reducing some chances for you to lose.
These people that are under such delusion should get themselves educated.
Sorry but this isn't going to happen. Humans, for whatever reason (Internet?) have become more and more lazy and ignorant. People don't care to know about things anymore -- they formulate this false idea and then stick with it regardless of the facts. You're not going to change that -- people have been trying for many years. You just have to accept it and let them fail on their own.
This is most likely why people keep blaming the site when they lose I'd say. People tend to be ignorant for the fact , math in this case since we are dealing with numbers (speaking of provably fair) . Still I do think that it is best to have an EDU thread regarding things about provably fair mechanism, martingale and any other stuff that is related to that.
So if in the future there is someone asking about either martingale or blaming the site for his lost, this will save some time by just pointing him to the EDU thread instead of going through endless discussion (like this thread for example)