He is using the term Vigilantism, but he clearly is very confused about what the term means.
Protecting homes, businesses, and people from violent criminals who are rioting is just normal, everyday self-defense.
Vigilantism is when citizens go and seek out a criminal and enact justice on the spot, on their own, without due process and a legal mandate.
Some who dies in the commission of a crime like rioting and looting has received all the process they were due.