You know, political calculation is really immaterial. Every Officer who took an oath to preserve, protect and defend the Constitution and ensure the Law of the United States is faithfully executed knows that the condition of a Felon (Unindicted to be sure) abusing the powers of Office to illegally Obstruct Justice can not long endure.
I can’t guarantee that impeachment will work out the way that you want it to because it probably won’t, but that doesn’t mean it’s not worth doing. Because if nothing else, we’d be standing by the basic, fundamental principle that nobody is above the law.