As Tong states above, these are two very different cases. I think the OP's blog poster says it best in this quote:
"Many would argue forcefully that its not only the right thing to do but its an ISPs job and duty to guard against clearly (or even arguably) inadequate attempts to open the door to mass litigation against its customers. That has enormous privacy implications. Shaw and Telus fought hard for this in 2004, with Bell and Rogers at least somewhat supportive. An ISP that stands up in this type of situation is not taking sides in the copyright wars; it is only defending its customer privacy which is arguably, at the very least, not only the right thing to do but the smart thing to do."
*The emphasis is mine and I feel it best represents how most of us (TSI customers) feel.