I know fascists do this, but doesn't everyone kind of? If you don't think your enemy has strengths then they're not worth being your enemy and if you don't think they have weaknesses then opposing them is pointless.
edit: I guess one difference is fascists pick enemies that genuinely are powerless, but that doesn't really seem to line up with the original claim
:this:
Zetkin also highlights that fascism will be somewhat weak/vulnearable as it starts to take power and becomes inevitably beauracratised. As its a sham revolution, it will never be able to provide the degree of strength, prosperity and security that it promised its followers.
Thus its appropriation of anti-capitalist rhetoric is revealed as demagogy instead of a real, material, political program for the working class. Contradictions re-emerge and the sections of the working class that supported it turn against it, giving socialists a chance to agitate and fight back against it.