It doesn't always take me the same amount of time to consider and comprehend something as it might take someone else.
The Surah you quoted doesn't make any mention of what he did. Though reading between the lines, it seems to say that what one should do is imagine that if people disagree with you, they must be erroneous. That doesn't necessarily preclude doing other things to them as well.
You're speculating. We
know what many, many Muslims did in response to them (and to Rushdie, and to a poor teacher who let her class name a stuffed bear "Mohammed").
"Islam" is the people, how they think and how they act. Not all Muslims are opposed to free speech rights. And I'm sure there are some that would take that Surah the way you do. But those exceptions merely confirm the overall tendency, as an obviously common trait among the world's Muslims and their leadership is to call for violence in response to what they deem blasphemous or offensive speech. And squelching ideas and speech is a death-knell to tolerance and understanding.