In government service you are not only responsible for avoiding conflict of interest but you just as responsible for avoiding the *appearance* of conflict of interest..
How McCabe could have been involved directly in decisions regarding the investigation of the Trump campaign is difficult to understand and its going to be very hard to explain.
This has always been amazing to me. His defense apparently is that he disclosed it to the FBI Ethics office and they approved. They said he didn't need to recuse himself. So the only honest conclusion you can draw is that they are crooked as well. Anyone can see his wife taking a massive contribution for a relatively minor office is problematic under the circumstances. The really surprising thing is just how brazen they were. The whole thing was based on the assumption Hillary would win and the media would ignore it.