What type of mantras and slogans?
I definitely think that no single activism group or "area" should get an outsized influence in education. Certainly it would be irresponsible for teachers or school boards to simply take an given activists group's curriculum or material and apply them as is.
While I understand the hesitancy, especially in the early childhood context, I do wonder what you how educators should approach topical things like black lives matter?
It acts as a shield because, no matter how useless the teacher is as an educator, any criticism of them becomes political criticism.