The Republican party has lost its way since Watergate and 1974 [View all]
In the modern era, since the 1920s, the Republican Party has traditionally been focused on self-interest-- lower taxes, less government, individual liberty, etc, so it's not surprising that GOP Senators of today act in THEIR own perceived self-interest, not the interests of the country. That was not always the case though. In 1974, it was his loss of support from GOP Senators that forced Nixon to resign. Of course, the country then itself was more supportive of American political traditions and wary of would-be autocrats.
There is no doubt that GOP Senators would have voted to convict him in an impeachment trial in 1974 forcing Nixon's resignation. His resignation ended his political career in disgrace. Trump's career should have ended in disgrace with a conviction in the Senate for inciting an insurrection against the country whose Constitution he had sworn to uphold, but thanks to craven, self-interested GOP Senators, he could easily run again in 2024. He will even claim vindication by not being convicted.
Why the difference between then and now? The quality of character of those elected to Congress (many had fought in wars like WWII against authoritarian regimes), and the culture of party-first created by a right-wing propaganda machine perfected first by Nixon's trainees, like Roger Ailes and Lee Atwater. Ailes' Fox News and their propaganda-spewing ilk coupled with social media of today, basically have created a party ripe for a man with authoritarian impulses like Trump. their Frankenstein monster, to take control. As a footnote, Ailes himself started Fox News so that another Nixon, a corrupt GOP President, would never be forced from office again, and he has indeed prevailed, though no longer alive to celebrate.
Our country faces a very uncertain future because our system favors a two-party system to ensure stability by balancing political power and one of the parties, the GOP, has now been completely corrupted by a manipulative self-reinforcing propaganda system that will lead to authoritarian leaders and the inevitable loss of American freedoms gained over more than 200 years.