It is worth pointing out that other governments have prosecuted and removed their presidents, prime ministers, and other heads of state, and their government still function.
This article covers a good assortment of those cases, from Sarkozy to Netanyahu.
https://www.pbs.org/newshour/politics/heres-when-other-countries-have-prosecuted-former-leaders
Unfortunately it predates South Korea's most recent crisis, and Netanyahu's use of the war in Gaza to stay in office.
https://en.wikipedia.org/wiki/Arrest_of_Yoon_Suk_Yeol
Last I checked, Isreal, South Korea, and France have not collapsed or lost any functionality by those events.
The argument US conservatives love to put forth is "contacting Georgia's governor and asking that he conjure up enough votes to help Trump win, that's an official presidential request, it was totally kosher" is wrong, and no other words other than "wrong" need to be used to describe it. Asking a governor to rig an election is not "the exercise of a constitutional power [that cannot] be infringed on [by] holding the individual personally liable" because it is not a constitutional power being exercised. It is just corruption and authoritarianism.
The supreme court stacked with Trump and Bush appointees, the ones who were installed there explicitly so they would abdicate their responsibilities and dissolve the separation of powers.
When people say they want Democrats to fight harder, what they're asking for is for someone to use the same dirty tricks as Republicans to defend their democratic institutions as opposed to tearing them down. To that end, we ought to wipe our ass with SCOTUS's ruling on presidential immunity. Merchan should have sentenced Trump anyway. Let the Republicans appeal back to SCOTUS, and then wipe our ass with their decision a second time.
It's distasteful to stoop to their level of dirty tricks and stall tactics, but playing by the rules is what fascists always count on to seize power. Even if we have to break our own rules, we should fight them with everything in the proverbial arsenal. The country and its people will not survive if they have their hands tied behind their backs by the paradox of tolerance.