Public Citizen: Federal court using scare tactics to block sharing of public records

> So why would they warn against RECAP on the basis that it is open source?
> And implicitly suggest that using closed source is somehow safer, in
> spite of all evidence to the contrary?

What makes you sure that they are warning because it's open source rather than just issuing a warning and mentioning that the program is open source? I think you are focusing far too much on the phrase "open source" and therefore reading too much into the statement.