Sophos detects Kali Linux's script as Malware and Trojans

Hi all, 

I am new to Linux in general and especially Linux anti-virus. Sophos Anti-Virus for Linux is the very first product I tried. I have been playing around with the built-in tools in Kali Linux and never thought of them as Malware/Trojans. I tried to scan the my fresh installed Kali Linux with Sophos and it returned with a list of malware warning. First, I was freaked out but then I noticed they were built-in Kali Linux scripts - see the attached pic. This when I get a bit confused. 

- How should I properly exclude the "my Kali script" warning but still have myself protected from "others' Kali scripts" and other malware attacking me?

- Most of Kali scripts are provided by the community members who are Hackers who knows which are white-black-gray?, how do I know the scripts are there to work for me but not the authors? Then is there a need for Anti Virus on Kali Linux or I should accept the fact that I am playing with fire? 

I would like to hear feedback and advises from you. 

Thank you,