Why will the Muslims comprehend (অনুধাবন) that they are responsible for all Muslims & need to act in unity?

It is the Reponsibility of Every Muslim to protect Muslims Under persecution (উৎপীড়ন).
It is apparent (প্রতিয়মান হওয়া) that Muslims are being oppressed (নির্যাতিত)& in affliction (শারীরিক/মানসিক কষ্ট) in palestine, Indonesia, East Turkestan, Egypt, Syria or in other parts of the World. Hundreds of thousand of unarmed civilians lose their lives in such conflict, women are raped, tortured and millions of Muslims are deported (নির্বাসিত) from their homes and countries, mutilated (অঙ্গহীন/অঙ্গছেদন করা)and lose their family members. Mulims countries lose their independence one by one and expect people of conscience to help them but they cannot make their voices heard.
Every Muslim of conscience should find it his responsibility to strive for saving these Musims who are suffering under torment.

Almighty Allah is informing us of this obligation for all Muslims:
“What reason could you have for not fighting in the way of Allah-for those men, women and children who are oppressed and say, ‘Our Lord, take us out of this city whose inhabitants are wrongdoers! Give us a protector from you! Give us a helper from you’? (Sura an-Nisa, 75)