"I, on the other hand, have faith in Allah and believe that he will reward those who suffer unjustly in this life. It is not for me to leave the path of Islam to seek that reward in this life"
PM,
To be logical, Why God created Satan to mislead humans? Isn't it some sort of injustice? I think definitely not because He also gave us the strength to fight satan. Then, naturally, God wants believers to fight injustice and establish justice. Would you then expect believers to endure the injustice quietly?

Hence, it is not tough to derive justifications.
I don't want to prolong this discussion but there is a need to understand terrorism than fighting it alone..