At least for the case of Belarus discussed here I see no other possibility, because the oppressors hide their faces and do not present any identification.
#1 is a link to another place where you don’t answer the same question.
#2 if you can identity the police using ML, then you can use those identities for any legitimate purpose that a badge number would be used for, such as collecting evidence against them, and clearly doxxing is not the only thing you can do.