Julio César Godoy Toscano is out of PRD. Guilty until proven innocent?

Godoy Toscano claimed he renounced from the PRD in order to avoid the party being a "scapegoat."  Yet it isclear the PRD leadership, first and foremost its national president Jesús Ortega, but also andresmanuelistas such as Alejandro Encinas, and, to be sure, Michoacán governor and half-brother of Godoy Toscano, Leonel Godoy, in unison demanded that the federal deputy leave the party, following the leak to the media of audio recordings where Godoy Toscano is apparently engaging in jovial conversation with a capo from the La Familia Michoacana gangster outfit.

How much the case has damaged the PRD is clearly far too early to tell, though I  take issue with the implications drawn from today's editorial in El Universal. Entited "The Naivety of the PRD," it argues,

"the PRD committed a very grave error in politics: To put their hands in the fire for a person whose incorruptibility was not guaranteed"

So because the PRD was not 100% sure of its innocence, it should not have backed Godoy's legal right to assume his seat as a federal deputy? This seems to me to turning the principle of presumption of innocence thoroughly on its head. Why on earth should the party not have backed the deputy until this point, when his corruptibility was far from guaranteed, not his incorruptibility? Following the release of the tapes, the PRD acted pretty swiftly to detach themselves from Godoy Toscano; to have done so earlier to me would have been to abdicate the very principle of presumption of innocence.