Murder is an act, racism is a POV. A totally deranged person has a totally deranged POV. It is absurd to assign rationality to an insane person.
Nice try. A POV can be irrational as you admit. Racism is certainly fundamentally that. People tie worth and ability to race. Not rational. You make it sound like racism is a rational POV. There is no need to assign rationality to the guy before you can call it racism.
Obsession or depression or many other mental illnesses could be called point-of-views. They are not acts, though they can lead to acts. Everything starts in the mind before it becomes an act. Crazy and crime are often intertwined with perverse reasoning. Certainly they are not mutually exclusive. It is not essential to discover which came first (chicken vs. egg argument) to label it what it is.
Why do you NEED for it to not be racism?