Trump is not necessarily the man who breaks the system, but he has - and will if re-elected - play an integral role in breaking down the barriers and normalising the sort of abuses that more competent successors will exploit.
Oh, please. Acts such as those for which Trump is being held "accountable" had been fully normalized for decades, in some cases centuries. The path to this moment was found, mapped, worn, paved, painted, lighted, and convenience stops built along the way by nearly every preceding administration before. The only way in which Trump is any different, was he was less competent in performing them, less interested in hiding them, and less capable of manufacturing consent for them among the general electorate.
Name one thing Trump did even remotely comparable to Ronald Reagan. Specifically, I'd direct your attention to the bombing of Libya, invasion of Grenada, Iran-Contra, and the S&L crisis for Reagan's overt criminality. And in the "legal, but morally reprehensible" category, I'd direct your attention to the provision of chemical weapons to Saddam Hussein, unequivocal support for apartheid South Africa and Ferdinand Marcos' fascist regime, busting federal employees' unions, destroying national mental health care, and blocking funding for AIDS research in the middle of a national health crisis.
That's a single president within living memory. Don't make me break out my history books.
As I've said (and have been saying), this isn't about asserting the rule of law, preventing a Constitutional crisis, rolling back the unitary executive, preserving separation of powers, or even holding a criminal accountable. This is about getting payback for (albeit accidentally) withdrawing the veil of ignorance over the American public's eye.