You cannot prove a general claim, such as 'requesting evidence never harms an argument', with a single example that provides support for it. One class of bad-f

You cannot prove a general claim, such as 'requesting evidence never harms an argument', with a single example that provides support for it. One class of bad-faith demands for evidence is the rhetorical ploy of trying to suggest that an argument is lacking evidence by demanding absolute proof where 'only' strong scientific evidence exists - see climate-change denial and anti-vaxxing for examples.