The endgame for an impeachment doesn’t have to be conviction and removal.
It works from a tranparency perspective as well.
DoJ has finished it’s investigation and concluded there was no prosecutable crime. A full up impeachment investigation and proceeding can now, publicly, expose everything that happened.
I don’t think that 5th Amendment protections apply, either, since DoJ has exonorated Lerner and the others. Why would you need 5th Amendment protections for something you’ve been exonorated of?
True, but it would be a waste of time, especially since the GOPe are de facto Obama cronies. Wait until Trump becomes Pres. (yes Trump deniers, he was on TV, so he will win) and then go for it.
If Lerner or anyone else pleads the 5th, then she/they prove the DoJ lied.