I feel the need to disagree vehemently!

The malicious has made an option. Had chosen. Willingly! And, supposedly – according to the hypothesis being discussed here, knowingly.

The ‘stupid’ just stays put. Until the relevant information penetrates his ‘thick skull’.
It’s not his fault that those who attempt to convince him are not skillful enough.

And if the ‘stupid’ happens to be in a ‘powerful’ position… (hence his inability to understand fast enough is liable to produce considerable damage) who needs to be chastised?

The ‘stupid’ himself? Who presumably ‘doesn’t have a clue’ about what’s going on?
The malicious who had made the whole situation possible?
The ‘lazy bystandards’? Who had allowed this to happen? Out of carelessness?

Or those who are liable to suffer the consequences? Who had understood what was going on but…

On the other hand… Could Dietrich Bonhoefer – a renowned pastor and theologian, utter such ‘simplistic’ words? So callous?

“Upon closer observation, it becomes apparent that every strong upsurge of power in the public sphere, be it of a political or a religious nature, infects a large part of humankind with stupidity. … The power of the one needs the stupidity of the other. The process at work here is not that particular human capacities, for instance, the intellect, suddenly atrophy or fail. Instead, it seems that under the overwhelming impact of rising power, humans are deprived of their inner independence and, more or less consciously, give up establishing an autonomous position toward the emerging circumstances. The fact that the stupid person is often stubborn must not blind us to the fact that he is not independent. In conversation with him, one virtually feels that one is dealing not at all with him as a person, but with slogans, catchwords, and the like that have taken possession of him. He is under a spell, blinded, misused, and abused in his very being. Having thus become a mindless tool, the stupid person will also be capable of any evil and at the same time incapable of seeing that it is evil. This is where the danger of diabolical misuse lurks, for it is this that can once and for all destroy human beings.”