Sacked for all the wrong reasons? (Maybe I'm wrong)

Bigger news than the Labor rebirth of Malcolm Turnbull is the Trump sacking of Comey.

The funny thing is, I see that the FBI has had to issue a letter correcting a lot of what Comey claimed  at his committee meeting last week - which exaggerated the seriousness of the renewed Clinton email investigation - and that certainly does hurt his credibility.

Yet (if I am reading it right) it seems as if Trump is sacking him for not having gone harder after Clinton, and hence it looks completely partisan and virtually corrupt.

I think this is going to hurt Trump bigly.   (I know, we stop copying his childish talk, but it's hard not to.)

Update:   oh, it seems I was reading it wrong.    At least Vox says the reason is (on the face of it) in support of Clinton.  

Update 2:   I'm not sure who is interpreting this right.   I can't really see how the Vox interpretation is correct....