Even if that where true (note that the wind is not pushing the blade directly away, but sideways), the tip of the blade is not responsible for most of the force

Even if that where true (note that the wind is not pushing the blade directly away, but sideways), the tip of the blade is not responsible for most of the force (since it mostly depends on the cross section area, intuitively). In other words, wind pushing the middle of the blade could accelerate the tip, even if the tip only produces drag.