it may be rational for Muslims to sense hostility and feel threatened by people who go around committing blasphemy according to their norms ...

Particularly when the 'blasphemy' is committed for the express purpose of committing blasphemy. By contrast, a Jehovah's Witness considers it blasphemy when someone salutes a flag, but probably realizes that every act of reverence for a flag is not done for the express purpose of offending the JWs.