Wa`alaykum As-Salamu wa Rahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
Thank you, brother, for your question, which reflects your desire to understand the teachings of Islam. We implore Allah to guide us all to the best and to grant Muslims every success, power, and strength.
In times of crisis, it is very important that all Muslims forget their differences and cooperate to serve the common cause of Islam against the challenges facing the Muslim Ummah. It is the duty of all Muslims to support our brothers and sisters with du`aa’ (supplication), to try to find an end to this aggression, and to alleviate the misery of our brothers and sisters in Palestine and Lebanon who are suffering under the yoke of an unjustifiable and dirty war.
We should never fail to support them morally and emotionally by speaking out against the atrocities committed against them.
In his response to your question, the prominent Muslim scholar Sheikh Muhammad Iqbal Nadvi, director and imam of Al-Falah Islamic Center, Oakville, Ontario, Canada, states the following:
My first comment is that as a Muslim Ummah, we are supposed to condemn and object to all forms of aggression and oppression. As Muslims, we are not allowed to attack others but at the same time we are not supposed to remain an easy target for others. What is going on has not been initiated by Muslims because Muslims did not occupy any nation or drive its people away. It is the legitimate right of people under occupation and aggression to resist and defend their own lands and families.
When the leadership of the Muslim Ummah is not unified and is not playing a significant role, then some groups start defending themselves. You may disagree with their tactics, but blaming them is not the solution. The solution lies in we as an Ummah playing an important role in solving the problem.