In your link I saw only one poet mentioned. And he was blind, so perhaps it was considered wrong to harm a person who had been punished enough by destiny (God). Or it could be equally seen as railing of a person against destiny (God) that had punished him. I believe people at that time often had such a perception of diseases. Moreover, we don't know how much critical he was in his verses of Islam or any other religion and how he worded his criticism. Perhaps he was subtle enough in allegories for the simple minds not to spot it. Plus, through almost complete illiteracy of population at those times I don't think his audience was large enough. Perhaps he was only known locally or (relatively) widely to a small group of literates. In both cases I believe those literates who didn't fancy his works might have seen to it that they were not made public or at least not widely known.
But you didn't mention any other men of letters (and not only) who were not so lucky. I'm sure there were many more of such cases.
It is true, though, that today, any of such blasphemies (as they see it) are known swifter and broader (like Rushdie). Moreover, with modern techniques of spinning and propaganda it is easier to give a desired/undesired explanation to anything and easier to stir larger quantities of people to violence.
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