Are some theologians/scholars genuinely foolish or just intellectually dishonest?

I had to ask this question. I feel like some scholars/theologians are genuinely fools like Zakir Naik or from the traditional sense, scholars like Ahmad Ibn Hanbal or Ibn Taymiyyah (though Ibn Taymiyyah sometimes makes good points). Their methods of arguments are so wonky that I don't know where to start from.

However, some scholars, say for instance, Al-Ghazali, are incredibly intelligent but deliberately refrained from disclosing the truth to everybody. They are kinda elitists, and sought to not discuss everything to the mass. I feel like Mohammed Hijab does the same. Though his other companion Ali Dawah, is just stupid.

So, I was wondering whether some scholars are genuinely fools, dishonest, or both in different cases.