Once people believe that a certain form or indicator is indeed useful (which may not necessarily be the case), they subjectively reject contrary evidence, which is also a manifestation of human weakness.
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Many traders, once they adopt a certain trading strategy, tend to develop a conservative bias that prevents them from recognizing or even seeing contrary evidence. They can only see a few cases that support a specific idea, and they either do not see or do not want to see more opposing cases. This is human nature.
People are always searching the market for what they want to see. Therefore, the attitudes of most people are not objective; they hold specific views about the market and cannot integrate into the true pulse of the market.
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A truly good trading strategy is: falsifiable. All scientific things are falsifiable. Falsifiability means acknowledging the infinite variability of the world; a particular theory may stand firm for now, but until it is proven wrong in the future, it is the truth. Those theories that are always correct and do not allow for questioning their feasibility are superstitions and blind obedience.