Scientists shouldn't debate gaslighters

[stopdiggin]

6. while scientist and doctors are sometimes reluctant to 'choose up sides'

(with some justification and sound reason)
I think it is important that they sometimes be encouraged to do so (particularly in areas of 'settled science.')
In the form of position papers, petition, signing statements of support, et.al.

Point being - rather than a 'debate' with the know nothings (which, as OP points out, is a thoroughly bad idea) - it allows for the simple statement, "The vast majority of people working within this discipline (and here are the numbers, XYZ, 98.6%) - are in complete disagreement with the position you espouse." End of discussion.