Probably won't do any good, but you could point to the numerous credible people that are saying it may have been a false flag to damage the GOP. An anon earlier was compiling these; at least two are former FBI profilers:
"There could be someone in there, some Democrat, low-level person – I'm not suggesting anyone on the top – but they just decided, you know what, 'I'm going to put this out because two weeks before a major election, who's gonna look like a bad guy here? The Republicans.'"
newsmax.com/newsfront/fbi-profiler-linguist-false-flag-operation/2018/10/24/id/887835/