If red hatted wolves were devouring NPR radio hosts, their cries for help wouldn't be sufficient. We would need external verification. Additionally, their editorial support for wolf attacks against opposing partisans would be hypocritical.
Exactly – Given your editorial stance, I expect that you would expect that, and yet the evidence here shows that you were wrong to: There was no compelling rationale for this action, thus NPR could not have reported one, thus they did not report one.
The problem here isn't with any bias on NPR's part, but with your personal claim of NPR bias, given that it is contradicted by the evidence we see here. Indeed, a position of 'evidence against my claim only proves my point harder' is nonsensical, and may itself be underlied by bias.