OJ was never convicted of murder, but he was found liable for wrongful death in a civil court. OJ’s right to due process was not denied by the civil ruling against him. The consequence of that civil liability is that he owes a shit-ton of money to the estates of his victims.
Trump was found to be civilly liable for having engaged in insurrection. The consequences of that civil liability is that he is ineligible to hold the office of President.
What we should be arguing is whether any executive actions he took between January 6th and Biden’s inauguration are valid, as he became ineligible to hold office on that date.