What's wrong with advising him to either produce the evidence or remove the tag, otherwise likely be removed from DT?
nothing.
why is no one bothered by this whole attitude of "we have an active investigation into this perp, he's guilty, no need to provide evidence, trust us"....? police, judge, jury, and executioner all rolled into one, and with DT privileges too.
this is the default trust system on display, right here.