You are right. There is an absence of evidence of impropriety.
Has McCabe said anything about the removal being unsupportable or did he just attack Trumps intentions?
Has McCabes lawyer said it’s not supportable or has he just attacked Trump?
Has either said any procedure was violated in his due process? No, they are appealing to public opinion through vague allegations of unfairness. That’s what people do when they can’t defend the real issue.
Alledge something specific or wait for evidence.
Obviously what the IG report shows was the reason for McCabe's firing is central, and Lindsay Graham stated that he wanted Sessions and McCabe to appear before congress about this issue.
I posted this earlier in the thread, below is McCabe's story of how things went down with Christopher Wray approaching him:
McCabe stepped down abruptly in January after he says FBI Director Christopher Wray approached him with concerns about what the inspector general had uncovered.
"(Wray) called me in on a Sunday night to tell me that he had been privy to information from the IG's investigation, and then based on that he was going to move me out of my position," McCabe said, explaining that he then decided to take a leave of absence.
Wray wouldn't tell him exactly what investigators found, but reflecting back now, McCabe surmised that if the approval of his outreach to The Wall Street Journal was the reason for his ouster, it would be somewhat hypocritical.
"In December, I had a ... long conversation with the editor of a major national newspaper at Chris Wray's request, and engaged with this editor in an effort to get them to back off a story that we thought would be harmful to our operational equities," McCabe said. "I was then removed from my position in January for having done the same thing in October 2016."
"I absolutely never misled the inspector general in any way,"
https://www.cnn.com/2018/03/16/politics/mccabe-fbi-firing/index.html