The Special Counsel's mandate was to look at how America's electoral system was compromised by Russia. There are many, many crimes that have been uncovered. A dozen Russians have indictments, having committed a serious crime in messing with elections and hacking computers. Trump's campaign manager is in prison, his personal lawyer is about to go to prison, and many others who are associated with Trump are facing trial or sentencing. Mueller is saying in his report that there is not enough evidence of criminal activity that would prove, beyond a reasonable doubt, that a crime has been committed. But just barely. Mueller goes out of his way to say that there is plenty of activity that is questionable and that he cannot exonerate Trump. He refers his findings to Congress to decide on whether impeachment proceedings are called for.
So is that your standard RFS? His actions are so beneath the office he holds, so questionable, so nasty... but not quite indictable. He lied, many times. He asked those who work for him to lie. And there are all the things that aren't even in the Mueller report. Telling the border patrol to break the law, and if they get charged he'll pardon them. Meeting with Putin in private and confiscating any notes. But go on. Keep defending him.