I found this troubling. He shouldn't have sent those texts via his FBI account. But, noone has said there was any bias in how he handled any of his cases. I don't understand what the fireable offense was. Demoting him, for sending personal texts, maybe. I think he should sue the FBI.
The FBI has fired Peter Strzok, the counterintelligence agent who came under fire for sending disparaging text messages about President Trumpand other political figures during the 2016 election.
http://thehill.com/policy/national-security/401558-fbi-fires-strzok-over-anti-trump-texts