I agree to the Kiddush Hashem that we made. We should always continue to Moser Nefesh for pidyon shvuyim.
However, the 2 cases are very different.
Knox is accused of Murder , her young roommate is dead. This is much different than the crime of unwittingly bringing in drugs.
The details of the bochurim’s cases were pretty clear cut.
The details of the Murder in the Knox case are not so clear.
Knox falsely accused her boss of the murder.