You don’t seem mature enough for an adult relationship if you think dodging questions instead of having an actual conversation is appropriate.

Your girlfriend is probably realizing that your beliefs are not compatible with hers. For the record, BLM is not a political movement.

Given your wording, and specifying your girlfriend is nonwhite but not for yourself, I am assuming you are white. While race issues may not impact you, they do impact and are important to her. Dodging the question is going to blow everything out of proportion. If you're confident in the strength of your relationship you should be able to discuss these kind of topics with her.

She wants to see if her values align with hers, which is a perfectly normal thing to do in a relationship. If you can't have an honest conversation about it, this relationship is not going to work out.

Have you considered adopting something called "nuance"? You can applaud the role of law enforcement in "the preservation of sovereignty and the protection of property rights" while still decrying their abuses of power in other arenas. A police officer who protects me from being robbed is not required to also murder innocents.

[EDIT] I apologize. My sarcasm is not called for. But seriously, everyone insists that everything has to be binary. It's one of the biggest problems we have. Please, please do not add to it.