The Trump trials are exposing what is broken about our political culture. Politicians don't know how to talk to people. They can schmooze and beat around the bush. They can use a thousand hours and a hundred thousand words to do nothing in a way that appears like hard work. But, they don't know how to talk to people so that something actually happens.
To a business man, the phrase "I need your help" is a polite way of making a request easier to turn down. In politics, asking for "help" is code for bribery. The two aren't at all related. When Trump told the Ukrainian president he wanted "help", he was being polite. But, the swamp in Washington mistook Trump for speaking their evil language of bribery. In psychosemantics, the term is "projection".
Trump's impeachment is purely along party lines. Statistics and figures agree. If you're a Democrat, you think his call to Ukraine was wrong. If you're a Republican, you think his call to Ukraine was somewhere between necessary and excusable. Any exceptions are marginal. This is pure party politics, which means that we can't debate the ethics of Trump's phone call among fellow Americans with any more success than we can debate guns, abortion, and redistribution of wealth. Now, impeaching the incumbent president for whatever lame reason we can contrive has been added as one more topic in a party-politics worldview.
Most rules that Democratic politicians object to are rules that the same Democrats created to use against Republicans just a few years prior. This new precedent won't be any exception. It might even come in handy one day, one way or another.