Democrats are doing now what they did back in 2010.
They may never get another opportunity to undo the Trump presidency, and so they have to use that opportunity before the 2010 election, when they suspect they will lose the house and be out of power.
In 2010, they also took the opportunity to try to take control or the American health-care system with Obamacare. It was their only hope after having tried for mover than 50 years to do so. They had the majority in the house and they were in a panic, and ended up with a one-sided vote for ACA, or Obamacare. Not s single republican voted for it, and that’s the case now with impeachment, were only democrats are talking impeachment. They will have to pull the trigger on impeachment, warranted or not, since it’s their only opportunity to do so.
And exactly like that unconstitutional 2010 power grab, the person who made it work at the Supreme Court by conjuring a tax out of the individual mandate, Chief Justice John Roberts, is the same person who will preside over the impeachment trial in the Senate. That's unsettling even if he is subject to the will of the Senate.