I feel like “official acts” would be something like, say, if say a former president died while the US military was attempting to secure confidential documents being stored at a golf resort, the sitting president wouldn’t be charged with murder, however, if you were to say, incite a riot and Order an elected official to defy election results to push the election that you clearly lost in your direction, you would not be protected. Since you are working in your own interests, not the interests of the country.
Because Trump lies. It’s old news. There was no way that debate was going to play well for Biden. He had nothing to gain. People voting for Trump are voting for Trump, people not voting for Trump are either Voting for Biden or staying home. Biden has to convince people not to stay home, not convince people not to vote for Trump.
The people that vote for Trump are people so sick of the current state of politics they want to burn it all down. Very few actually think he’s a great president. He’s a troll vote. Biden’s performance made more people want to watch the world burn.