The general justification for appropriating the tag has been that, in addition to killing Black people, White supremacy also continues to kill and harm a lot of non-Black people of color as well.
This year we have really highlighted the tragic deaths of many black people. We call people out for their racist behaviors and views. We are getting closer to uncovering the corruption some people have and cancelling them for having them. In this case I feel cancel culture would be legitimate because of how these people are looking down upon groups of people.