The difference you see is between a sponsored protest and unsponsored. Basically, bleeding heart liberals have been successfully convinced to align with Hamas without them explicitly realizing it either. This is a good primer on Hamas in the US and their general media strategy:

https://extremism.gwu.edu/sites/g/files/zaxdzs5746/files/202...

Kind of interesting to keep in mind when people protest for a ceasefire instead of say, Hamas removed from power and free open elections resumed for Palestinians.