Uncertainty is not the enemy; claiming that the presumption of market fraud fundamentally opposes negative fraud tactics masks a key asymmetry in market dynamics. This rigid approach does not consider the opportunity where manipulation can reveal an upside for a perceptive investor, provided there is a solid conviction. The presumption is a tool for recourse, not a barrier to maneuvers; manipulation tactics, on the other hand, are a reality to navigate boldly. For example, deceptive negative statements before a share buyback by a Canadian company do not 'oppose' the presumption; they create a context where the latter becomes all the more relevant for investor protection in class actions. One must delve into it, not shy away from it out of excessive caution, because an efficient market rewards the ability to discern true risk from mere volatility.