Hiliary Cass isn't just an academic, she's actually practiced and still practices (I think, or did until recently) front line medicine. And she spoke up against the consensus, loudly. Backed up by evidence.
Obviously death threats are actually criminal and should be prosecuted.
However, I can see why academics are automatically dismissed now by many people. Because what they say, and often what they research, is all about being in an ivory tower and cushy lifestyle that most people in the real world can only dream of. And people suffer real world harms that are just not being acknowledged. As MaybeDoctor says why not join up with practitioners? I think Jo P tried to do that for prisons, saying look at the real world consequences and there have been NO REPURCUSSIONS for how she was treated by colleagues for trying to do that.
I've been in academia myself and I just don't trust academics anymore. Now I work more closely with frontline harms - particularly those experienced by children and I'm really, really angry. For the children mainly but also for the low paid, minimum wage staff trying to pick up the pieces of the harm caused, like TAs. The people without a voice and themselves victim to sacking if they speak up, even when they're speaking up for safeguarding (many, many cases of this), unlike academics who seemingly don't get fired even when found to have bullied a colleague in a court of law.
I'm sorry but dealing with the consequences in reality just doesn't compare to having to argue with tin foil hatters or other captured academics and those academics who've stayed silent should hang their heads with shame because they could have spoken up and chose not to.