There are two types of people who do evil. Those who want to do evil, and those who cannot help it. The Chovos Halvavos is loaded with proofs of how the main thing is what you want to do, & Aveiros: ְבּשׁוֹ ֵג ג done unintentionally are a different world than: ְמ ִז ִדי ןי intentional ones.
We see that not only is: היֵרְטַפּ אָנָמְחַר סֵנוֹא ב"ק כח ב (you are not punished for something is beyond your control), but those who didn’t want to do evil can be considered special in the same area they were Nichshal! We can suggest that although Shaul was loaded with Kin'ah against Dovid, he is probably totally innocent because he had a Ruach Ra’ah. And he surely wished to be a total Ayin Tova person, since Dovid who symbolizes Malchus was unusual in Ayin Tova. Dovid saw goodness in his worst enemies, like Shaul, Avner, Shim'i ben Gera, and his wicked son, Avshalom. We can suggest that in truth, Shaul was a true Melech who excels in Ayin Tova (we find him being super nice and forgiving to people who defamed him in the beginning of his reign) but the Ruach Ra’ah caused his Kin'ah. Hashem, who is total truth and Rachamim, understood the true greatness of Shaul, so in his death, his body remained whole, like an Ayin Tova person.
