You need to take into account your priors if you so quickly dismiss the David Hogg effort because he has been vocal about his intent (and DNC leadership freaked). But you appear to not spend time in places like Boston or San Francisco or even small deep blue municipalities like Burlington VT. A symbolic anecdote here in Boston that wasn't big news but left a mark was when an African American city councilor called into question the ethics of a process where a black woman was en route to become interim Mayor. The local head of the NAACP (who then ran for statewide office) called it racism for the Councilor to even question the process. The impact was to silence any and all participants in the discussion. Many many examples where Dems in deep blue districts who miss a few questions on the purity test get cast out and the lesson reverberates among anyone else who wants in.
You need to take into account your priors if you so quickly dismiss the David Hogg effort because he has been vocal about his intent (and DNC leadership freaked). But you appear to not spend time in places like Boston or San Francisco or even small deep blue municipalities like Burlington VT. A symbolic anecdote here in Boston that wasn't big news but left a mark was when an African American city councilor called into question the ethics of a process where a black woman was en route to become interim Mayor. The local head of the NAACP (who then ran for statewide office) called it racism for the Councilor to even question the process. The impact was to silence any and all participants in the discussion. Many many examples where Dems in deep blue districts who miss a few questions on the purity test get cast out and the lesson reverberates among anyone else who wants in.