The hearings have shown, Donald Trump was in the room. Was it treason? The framers of the Constitution had “a very specific image in mind — men gathering with guns, forming an army and marching on the seat of government.”
Impeachment is a constitutional tool designed for times of extraordinary abnormality — say, for instance, when a president presides over an obscenely lawless administration. It's a way of bringing politics back to normal.
Time is short and the risks of failure are high, but Democrats have no choice except to proceed. The anonymous whistle-blower's complaint that the House Intelligence Committee released is a straightforward and clearly written document.