Why do Muslims look with great sensitivity and consider it an attack upon them when mentioning Islam or Mohammed?
The answer:
Muslims look very sensitive or jealous only when mentioning Islam or Mohammed with such unwarrantable violent attacks.
A Muslim also gets jealous if someone wants to mock or make fun of the divine Godhood or the prophet (May the blessing and peace of God be upon him).
This is human nature; anyone of any nationality easily gets fanatic, enraged and maybe irritated if someone insults his father, his mother, his country or his place, what if the offense is about his creed and faith?