Of course not, nothing is. The point is you can question his methods all you like but you can't question his motivation. What it really comes down to is that he chose to act and the "alien armada" wasn't even his idea and didn't enter the war until after he was captured.
I can't, having all the information I have. But if I had been in Earthforce or Earthgov, I could have. I could have even known Sheridan well and STILL question whether that was the right way to do things, as some did.
There was room TO question.