The really loony part here ... okay, among the really loony parts here ... is the fact that the news reports that triggered the Inpatient Prez's latest tweetstorming isn't even primarily about Comey. It's about a serious and unprecedented counter-intelligence investigation into whether the highest official in the land is compromised by a hostile foreign power.
Trump doesn't comprehend abstract things like policy (or, for that matter, the Constitutional order). He has to reduce it to a few personalities. There's Comey, Clinton, Obama ... if there isn't a name he can hang on something, and then either love or hate it, it just doesn't fit in that damaged brain of his.