Why performative allyship/activism is more dangerous at times than active racism, sexism, etc.

I can vividly remember a time in my career before the advent of the "speak-up" culture movement. This was a time when organizational bad actors went unpunished and anyone who dared to confront a toxic work presence was denigrated and denied future opportunities. People's voices were suppressed and this led to senior leaders who maintained their deniability regarding these bad behaviors until they were forced back in line by regulators fining them for disobeying the rules. The