Maybe partly, but I think it is more than that.
Children with difficult backgrounds can be more vulnerable themselves to ideologies like this.
And also, once a best practice is established, foster parents or guardians just don't have much choice about following that. It's kind of like parenting is completely subsumed in a liability culture.
Social work itself seem to jump on just about every stupid progressive bandwagon you can imagine. Progressive social justice frameworks are baked into the ideological basis of almost every social work department you'll find.They are extremely hostile places for anyone with any political, social, or religious views which aren't in line with that. People who aren't on board get weeded out of social work unless they are pretty determined.