Islam must always be defended.
Defence is the right of every community against any type of aggression. Qur’an ask the believers to be prepared to defend themselves, the common saying ‘weakness invite aggression’
“Indeed, [even aforetime] did We send forth Our apostles with all evidence of [this] truth; and through them We bestowed revelation from on high, and [thus gave you] a balance [wherewith to weigh right and wrong], so that men might behave with equity; and We bestowed [upon you] from on high [the ability to make use of] iron, in which there is awesome power as well as [a source of] benefits for man:42 and [all this was given to you] so that God might mark out those who would stand up for him and His Apostle, even though He [Himself] is beyond the reach of human perception Verily, God is powerful, almighty!”[Qur’an; 57:25]
“Against them make ready your strength to the utmost of your power, including steeds of war, to strike terror into (the hearts of) the enemies, of Allah and your enemies, and others besides, whom ye may not know, but whom Allah doth know. Whatever ye shall spend In the cause of Allah, shall be repaid unto you, and ye shall not be Treated unjustly.”[Qur’an; 8:60]
In every fight, physical, moral, or spiritual, Muslims have to arm themselves with the best weapons and the best arms against their enemy, so as to instill wholesome respect into him for you and the Cause one stand for. There are always lurking enemies whom you may not know, but whom Allah knows. It is duty of every Muslim, to be ready against all, for the sacred Cause under whose banner they are fighting. Be always ready and put all your resources into your Cause. You do not do so in vain. Allah's reward will come in various forms. He knows all, and His reward will always be more generous than you can possibly think of.
[Allah knows the best]