GAW, you are wrong. It is clear from the Gemorah and Meforshim Rishonim and Achronim that the type of punishment indicates what’s worse. That’s why someone who does chayavei krisos or misos beis din needs suffering to atone for his sin while someone who violates a simple (so to speak) issur does not. That’s why a positive commandment does not push aside an issur kores and so on and so forth. Ok, some bein adam le’chaveiros might not have an issur kores on them but one can be very punished for them. That’s true.
Secondly, GAW, if a frei Yid knows that the Torah is true (even without internalizing it) and does not keep it, he is a rosha.
Interjection, it is openly stated in the Rabmam’s Hilchos Teshuvah. Do you belive in what it says there?