If Comey is Republican, then he is biased. If Comey is Democrat, then he is biased. If Comey is a Green Party member, then he is biased.
Just because you believe it is one of these and not the one he claims doesn't change the fact that no matter what it is/was, the "problem" would still exist. I imagine the problem exists with all law enforcement. And in fact, I am willing to guess that more often than not, even in the FBI, the bias is in favor of Republicans.
We don't whine about. You shouldn't either.