That this doesn't rise to the impeachable level.
No honest person can look at this mountain of evidence - the mountain that is always rising - and truly believe that Trump did not do EXACTLY what the House Dems have accused him of doing. He is guilty.
You can defend those actions, I guess, but it is simply intellectually dishonest to deny them. And it is no exaggeration to say that denying them further erodes our democracy.