I think back to something Cohen (I think?) said. When Trump tells these easily disproven lies, the point isn't that you believe him. The point is that you go along with his preferred reality.
And when we're in a moment where Republicans either fall in line behind the lie or resign, Democrats tut-tut on Twitter, and the news media calls him out for one news cycle before it's on to the next thing, going along with Trump's preferred reality is almost what happens.
I think the reality most voters are having to deal with (and why we saw such massive turnout in 2018) is that no, you can not just trust the system to ensure that everything will be fine, the only person who can truly hold Trump, Republicans, Democrats, whoever you want to blame at any given moment accountable is
you.
There are no failsafes in the Constitution or law that prevents a total lunatic from assuming power. On paper, the Electoral College is supposed to do that, but in practice the electors are generally partisan hacks (for good reason), so no help there.
The only real line of defense for checks and balances are Congress, but voters gave Trump a Republican Congress to deal with initially, and partisan polarization has become too extreme to allow party members (on either side, the Democrats less so) to step too far out of line. There's a reason the only Republican Congressman to call for Trump's impeachment immediately dropped the party label. There's also the judiciary, but hey, guess what? That's been stacked with Republican appointees who will rubber stamp any Trump action that comes before them (Roberts nixed the Census question, but only because Trump wasn't subtly evil enough). The conservative majority on the Supreme Court? Appointed exclusively by Republican presidents who came into power after losing the popular vote, including Gorsuch whose nomination was stolen from Obama.
Ironically a lot of the time it was the nihilistic, faux-realist "both sides are the same, maaan" morons who were scrambling for anything to get us out of the specific jam of having Trump be our president, sharing articles in December of 2016 about how the Electoral College could still totally make Bernie the president, proudly boasting that congressional gridlock would prevent Trump from getting any super-conservative justices on the Court and that we could just flood their hotline to pressure them into making favorable decisions (which goes against, you know, the entire point of the courts being technically nonpartisan and insulated from populist concerns).
The truth is, for a long time politics was just something people put their blind faith into that our elected officials were working with our best interest at heart, and that it was something you could safely ignore outside of a few months surrounding the presidential election. This is especially true for the eight years during which Obama was president - liberals did not take Republicans seriously, sat out elections and watched as Republican governors and state legislatures ravaged public services state by state, because ultimately Obama held the veto pen and could prevent anything REALLY bad from happening. This also led to a lot of misplaced blame - I had liberal friends ask me in earnest why Obama didn't just demand Rick Snyder resign during the Flint water crisis, as if this was some unique power the President had and was simply choosing not to enforce. Or why he wasn't pushing for a constitutional amendment to ban Citizens United, something that even at the Democrats' peak of power under his presidency would absolutely not have passed. This mindset carried on through Clinton's candidacy - even if they didn't vote for her, liberals felt it was safe to assume that she would win the presidency and prevent bad legislation and judges from happening at the federal level.
If there is one silver lining of Trump's presidency, it is that it is exposing the limitations of our system, both in stopping crazy assholes from taking power and exploiting executive power to say, lock children up in cages as well as his ability to actually do anything. He signed an executive order on day 1 that "repealed Obamacare" and those same liberals were asking me if this meant that Obamacare was repealed. No, it doesn't, because the President can't just executive order away giant social programs. Just like how your lord and savior Bernie Sanders couldn't just sign an executive order giving everyone free healthcare and college, or bully Paul Ryan and Mitch McConnell into legislating them if need be.
Of course, that's only a silver lining if Trump loses, but civic engagement remains the same. If Trump loses and everyone breathes a sigh of relief because thank God, that asshole is gone, I don't have to care about politics anymore and turnout drops to 30% in the next midterm and Republicans win everything so they can stymie the next president, the pain and suffering under Trump's term will amount to absolutely nothing.