Aleppo represents one small, but important, enclave in Syria. More than three quarters of the country is under occupation by ISIS or other Islamicist forces, Turks,  Iraqi Kurds,  US special forces and 'democratic rebels' supported by  a western 'anti-ISIS coalition' eminently willing and able to rain airborne destruction on whatever targets they choose and to provide an 'arsenal of democracy' to those who want to 'take Assad down'. 

The 'meltdown for humanity', compared to the ongoing threats to other places in Syria, is notable only because it is so much a  western media 'dog-wagging exercise'. Most of the other travesties - especially those caused (accidentally) by 'humanitarian' forces -aren't reported at all.