It’s the shaming of police officers plain and simple, to  suggest they can come but not in uniform  is grossly insulting.
This is what they do, police large events and ensure  safety for all.  Like a fireman the uniform serves many uses, t-shirts and jeans are useless.
This is particularly troubling given the  struggle gay officers went through internally back in the day .They more than anybody  have the rite to ware their hard fought uniform with PRIDE !!!!
Perhaps if Black Lives Matter cares so much about fighting for civil liberty's they should go ware they are needed  rather than invading the gay pride parade.