Re: the claims of death threats, and now letter bombs (a new one to me), I think there might just be some real value in a well-targeted FOI request about this. I'm putting this out there in the hope that somebody has more time available than I do, and can work on this...
There was a claim at some point (I forget by whom and where) that there is now a special unit in the Met Police (or somewhere - who/where exactly this alleged unit is, is crucial) for dealing with incidents of ME/CFS-related harrassment. So: an FOI request to the Met (or the relevant police authority) for the number of incidents, in each year for the last 5 years, of (a) email death threats, (b) letter bombs, (c)... etc - and details like the number of prosecutions of perpetrators that resulted from the investigations. Perhaps also ask for the number of ME activists who are considered by the police to be dangerous and a threat to researchers. Oh, and the number of working hours per week that the special police unit dedicates to this issue. The answer to that might be funny...
It would all have to be worded just right and ask the right questions, but I think we're all rightly quite confident that the numbers are going to be very small and that in terms of actual legal action / prosecutions there have actually been very few, or probably none. Getting a statement on the record, from the police, of just how small these numbers are, that ought to be the perfect rebuttal in future for anybody making these claims.
The details of the actual incidents themselves are typically not going to be things that can legally be discussed in public. It's the same with forum moderation: if somebody writes something really offensive to somebody, you simply can't repeat their abuse of that person by telling the world what they said or did that got them banned. So we can't expect people to produce the evidence of exactly what was said, by whom and to whom, but getting some total numbers of incidents in various categories ought to be possible, and likely very useful.