Imagine this: a popular member of the community is found to have murdered his family, but he cannot be brought to justice because it would tear the community apart.
Or this: a popular member of the sales staff at Macy's has been found to have refused to wait on minority customers, but she cannot be fired because it would tear the store apart.
Or this: the cutest little guy in second grade brushes the face of the cutest little gal in second grade with red poster paint, but he cannot be sent to the principal's office because it would tear the class apart.
If these scenarios make sense to you (and they exist obviously in decreasing order of criminality) then you should have no difficulty understanding why Trump cannot be impeached.
I do have that difficulty, and it's increasing daily.
A few weeks ago a poll was released which affirmed, in part, America's lack of interest in impeachment. But remember, the poll was taken shorty after William Barr's cursory report on the Mueller probe—the report that exonerated (some, like me, would say beatified) the president. In the afterglow of that fabrication, why would Americans want impeachment? Why would anybody? After all, on the horizon were infrastructure, jobs, immigration, trade—all matters that affect Americans daily.
That was a long time ago, especially in the era of the 24-hour news cycle. Since then Barr was found to have falsified his report, then kept secret a critical correspondence with Robert Mueller. More recently he failed to show up at a Congressional hearing whose format he found snitty. (Thanks for the word, Bill—it fits you perfectly.)
Meanwhile the president he serves (some, like me, would say slavishly worships) has spent the past two weeks urging everyone associated with him to ignore Congressional subpoenas, i.e. defying the separation of powers by arrogating all power to the executive branch. Like an autocrat. A dictator. A king. He wants Maduro gone from Venezuela though the two men's behavior reflect similar beliefs.
Let's take that impeachment poll again—now that we know more of the report, of Trump's refusal to cooperate, all his "I don't remember" answers, the recent retweets of racist dogma, the blatant ordering of associates to break the law, the recent exposure of his $1 billion-plus losses that belie his financial wizardry. The more we know about him, the more palatable impeachment becomes. And if the Republican Senate refuses to vote against him, so be it. We can use any accumulated testimony and discovery to inform our 2020 voting decisions.
Or, if you prefer, don't take the poll. We really don't need one to convince us that the kid with the paint brush deserves a trip to the principal, that the salesperson at at the mall needs a job that precludes interactions with human beings, that the pillar of the community should spend the rest of his life in prison...and that Donald Trump has committed enough high crimes and misdemeanors to stand trial for them.