I guess the big question is, is there anyone (other than those profiting directly from CWS) that would complain if a provider were to do such a thing...
looks like a psi-net "pink contract" inherited by cogent. but since the psi->cogent rollup was an asset sale rather than a corporate merger, cogent probably isn't bound by that contract. somebody needs to get on the phone, i guess.
This is a problem with implementing private justice. Do you have all the facts? The CWS trojans are not downloaded from the Cool Web Search site. Could this be a Joe job by someone who doesn't like the owners of Cool Web Search? The owners of the Cool Web Search company deny they are the creators nor affiliated with the creaters of the CWS trojans. Maybe they are lying. Maybe other Joe jobs have lied too. Blocking or de-peering the service provider for Cool Web Search will not prevent you from being infected with CWS trojans any more than blocking or de-peering the service provider for Google will prevent you from being infected with Google trojans, or blocking and de-peering the service provider of Paypal will prevent people from sending you mail offering to update your Paypal account information, or blocking and de-peering SCO would prevent people from being infected with viruses which attacked the SCO web site. I don't have all the facts. Maybe someone else does.