Zucker was fired due to a smear campaign orchestrated by Trans activists, mercilessly lobbying that his approach of not granting every child immediate pharmaceutical intervention a form of "conversion/reparative" therapy.  Adolescent patients who made accusations of abuse against Zucker, confessed to fabricating them as was uncovered by Jesse Singal in his article. http://nymag.com/scienceofus/2016/01/false-charge-helped-bring-down-kenneth-zucker.html
 CAMH never fact checked or investigated the allegations. Some accounts it appears they knew they were false but posted them as reasons anyways. It was a mess. 500 medical professionals signed a petition protesting his dismissal to no avail.