Soul is not immoral at all. There are three types of souls mentioned in Quran;
1. Al-Nafs Al-Ammarah which trends towards bad desires. This Nafs is to be avoided when it instigates towards bad. Allah (SWT) provided man with intellect (Aql) or reason to tackle the bad temptation. ونهى النفس عن الهوى فان الجنة هي المأوى
2. Al-Nafs Allawaamah which blames the person when and after doing bad to rectify him.
3. Al-Nafs Al-Mutma'innah which is in full peace and tranquility because of the high state of Imaan.