There's no ambiguity about what happened, and I'll dispense with the politically correct caution if it's all the same to you. Four angry black people - and it's about race because of their words and their deeds - held a mentally disabled white person against his will, tortured him and yelled obscenities about white people in general and Donald Trump in particular. In other words, it was a racially and politically motivated act of kidnapping and torture. Case closed. Nothing further to discuss on that issue:
Chicago investigators are questioning four African-Americans after a Facebook Live video shows a group of people torturing a white mentally disabled man while someone yelled "F*** Trump!" and "F*** white people!"